Bacalar or Merida?

Bacalar has the better swimming, though neither city has a classic beach. Its freshwater lagoon is calm, around 28°C and coloured from pale aqua to deep blue over a white limestone bed, and you swim from wooden docks, hotel jetties and public balnearios, with Cenote Azul and the gentle current at Los Rápidos for variety. What you won't find is sand to lie on or surf.

Merida's sea is at Progreso, 40 minutes north, a wide but plain stretch of Gulf shore with shallow green water and weekend crowds of local families. The swims people remember there are in the cool, clear cenotes inland, which feel quite different from Bacalar's warm open water.

Both towns cook the same Yucatecan dishes, but Merida is where they are made best and in the greatest variety. Beyond cochinita pibil, panuchos and sopa de lima, you find relleno negro, papadzules and queso relleno, cheap breakfasts in the Lucas de Galvez and Santiago markets, and marquesita carts around the squares at night.

In Bacalar the same regional basics come from a few taquerías and cocinas económicas, plus lakeshore kitchens serving fish and ceviche with a view. It is pleasant, but after a few days you will be back at the same tables.

The gap here is wide. Bacalar's single real sight is the eighteenth-century Fuerte de San Felipe, a fort built against pirates, with a small museum and ramparts over the lagoon. The rest of the town takes an hour to see.

Merida can fill several days. The cathedral of San Ildefonso was built from the stones of Maya temples, and the Casa de Montejo and the murals of the Palacio de Gobierno stand on the same square. The henequen-boom mansions of Paseo de Montejo and the Gran Museo del Mundo Maya are the best introduction to the region before seeing the ruins.

Bacalar goes to bed early. There are a few bars on the square and the shore, drinks in the hostels and the occasional weekend band, because most people are up at dawn to paddle.

Merida comes to life after dark, once the heat breaks. There are mezcal bars and cocktail terraces along Calle 60 and around Santa Lucia, rooftops over the old town, and cantinas where every drink brings small plates of food. A few clubs keep going past midnight at weekends. It is a relaxed, sociable scene rather than a party town, but it is far livelier than Bacalar's.

Bacalar's lagoon gives it the edge. Over 40km of shifting blue water edged with mangroves can be explored by kayak or paddleboard, with sailing trips to the Pirates' Channel and the Bird Island sanctuary, and stromatolites, among the oldest forms of life on earth, in the shallows.

Merida's landscape is mostly underground: the cenotes and caverns around Cuzama and Homun, reached by bicycle or horse-drawn rail cart. A longer outing to Celestun takes you by boat through mangroves to see flamingos. In both places the land is flat, hot and poor for hiking.

Merida is the stronger base for the Maya world. Uxmal and the Ruta Puuc sites lie about an hour south, Chichen Itza and Valladolid make a full day east, and Dzibilchaltun, Mayapan and the all-yellow town of Izamal are easy shorter trips, with restored haciendas scattered among them.

From Bacalar the ruins are quieter but less important: Chacchoben in the jungle, the stucco masks of Kohunlich paired with Dzibanché, and Chetumal's museum of Maya culture. From both places a car or a tour makes these trips much easier.

Merida is slightly easier with children. The Parque del Centenario has a free zoo and playground, Animaya is a bigger zoo, and the evening squares with balloon sellers suit families. Cenotes and the shallow sea at Progreso add swimming, though the ruins mean long hours in the sun.

Bacalar offers one excellent thing: warm, waveless, often very shallow water, where children can spend whole days floating and jumping off docks. Away from the lagoon there is nothing for them, so it suits a lakeside lodge with its own dock and children old enough to paddle.

Merida's numbered street grid makes the centre easy to find your way around, and most sights are a walk from the Plaza Grande, though narrow pavements and the midday heat slow you down. Taxis and ride-hailing cover the rest, and buses reach Chichen Itza, Valladolid and Progreso.

Bacalar's centre is only a few blocks, but the lodges, balnearios and Cenote Azul are spread for kilometres along a shore road with little room for walkers, so you will rely on taxis or a bicycle. In both places a hire car opens up the ruins.

Merida is where Yucatecan crafts are bought. It has hammocks in every size, guayabera shirts, palm-fibre Panama hats from Becal and embroidered huipiles, sold in the chaotic market streets and in finer galleries in the restored houses of the centre, with malls in the north for everyday brands.

Bacalar has a few stalls near the square selling hammocks, embroidery and beachwear, and little else. If you want a good hammock, buy it in Merida.

Merida stretches a budget further. Market meals and street food cost very little, cantina snacks come free with drinks, and many cultural evenings are free. The courtyard boutique hotels cost more but are still fair for what you get.

Bacalar can be just as cheap if you stay in town, with local food, bicycles and shared boat trips costing little. The catch is that the lakeside lodges with private docks, which are why many people come, are priced like the Caribbean coast. In both places car hire and ruin entry fees are the main extra costs.

Merida has a real performing arts scene, built on free shows in its squares through the week: jarana dancers in white embroidered dress, trova trios at the long-running Santa Lucia serenade, and the Mayan ballgame re-enacted before the cathedral. The Teatro Jose Peon Contreras adds the Yucatan Symphony Orchestra and ballet.

Bacalar has none to speak of. The most you can expect is a weekend band on the main square.

Bacalar is the more restful place. Its days follow the light, with a dawn paddle, a hammock through the heat and a swim at sunset, and many lakeside lodges have no road noise. Yoga, short retreats, massage and the temazcal steam ceremony are offered locally, though there are no large spas.

Merida's slow pace comes from shuttered afternoons and courtyard hotels with plunge pools, and the proper spas are in the restored haciendas outside town. The centre's traffic and the exhausting heat from April to June make it harder to switch off there.