What are the best day trips from Cozumel?

The Ultramar ferry from Cozumel's downtown pier to Playa del Carmen runs every 1-2 hours starting at 6am, costs around 220 MXN ($13 USD) each way per person, and takes 35-45 minutes depending on sea state. Buy round-trip tickets at the pier; the return schedule thins after 10pm. Playa del Carmen itself is worth 2-3 hours if one of you wants to browse Quinta Avenida's shops between 12th and 28th streets while the other sits with a cold Montejo at a sidewalk table. The salt air off the channel tends to get rougher in late afternoon, September through November. If either of you gets seasick, take the ferry early and come back before the 3pm chop picks up.

For a day when one of you wants ruins and the other wants sand, rent a car (around 800-1,200 MXN per day from rentadoras near the cruise terminal) and drive the island's transversal road. San Gervasio sits 17 km east of San Miguel, a compact Maya site where Ixchel, the fertility goddess, drew pilgrims from across the Yucatan. It takes about 90 minutes to walk the raised stone paths between temple platforms. The entry fee runs around 250 MXN per person. From there, continue south to Chen Rio on the windward coast, where a natural rock pool breaks the Caribbean surf into something warm and swimmable. The restaurant right on the beach serves whole fried fish with coconut rice for around 250 MXN. That combination tends to satisfy both the history person and the one who brought a novel.

Punta Sur Eco Beach Park sits at the island's southern tip, about 27 km from San Miguel. Entry currently runs around $18-21 USD per person. The Celarain lighthouse from the early 1900s gives you a panoramic view of the reef line and, on clear mornings, the mainland coast. Mind you, the park also has a small crocodile lagoon and a Maya navigation shrine called El Caracol. Arrecifes de Cozumel National Park, established in 1996, protects the reef system along the island's southwest coast. Snorkel trips from dive shops along the San Miguel waterfront cost 700-1,200 MXN per person for a 3-hour outing covering Palancar and Colombia reefs. The water temperature hovers around 28 degrees Celsius most of the year, and visibility on a calm day might reach 30 meters. If one of you dives and the other prefers to snorkel, most boats accommodate both on the same trip.

Tulum as a day trip from Cozumel is feasible but tight. Take the 7am or 8am ferry, then a colectivo van south along Highway 307 from Playa del Carmen. The colectivo fare runs about 45-50 MXN per person, and the ride takes roughly 50 minutes. The ruins sit on a 12-meter limestone cliff above the sea, and the site opens at 8am. Arrive by 9:30am and you'll have the clifftop mostly to yourselves for an hour before the Cancun tour buses roll in around 10:30. To be fair, the ruins themselves are small, maybe 45 minutes of walking. The real draw is the beach below the castillo, where you can swim in warm, shallow water with the ancient walls above you. Grab lunch at a taco stand on the access road, cochinita pibil for 40-50 MXN, rather than the overpriced restaurants near the parking lot. Plan to catch the 6pm or 7pm ferry back.

Chichen Itza from Cozumel is technically possible in a single day but likely not worth the exhaustion, and for couples it risks the overcommitted-itinerary crash that ruins the evening. The logistics add up to roughly 12-13 hours of travel for 2-3 hours at the site. A better use of that energy is a cenote trip. From Playa del Carmen, Cenote Azul sits right on Highway 307 about 25 km south, with a 200 MXN entry fee and no reservation needed. The water drops to about 25 degrees Celsius, noticeably cooler than the sea, and the limestone walls keep the pool shaded until noon. Cenote Cristalino is next door, smaller and quieter. That pair makes a gentle half-day that leaves the evening free for dinner back on Cozumel, which tends to be the better play for couples who don't want to stumble back to the hotel at 10pm too tired for the restaurant reservation they planned three weeks ago.