This is just one cenote, but there are multiple you can visit in different hours around Cancun. Most you can swim in! If you Google “Cancun Cenotes” multiple options will come up!
There are lots of day trips that go to the island or you can go on your own by ferry! Isla Mujeres has diving, snorkeling, shopping, beaches and go-kart rentals to drive around the island! It is about a 30 minute ferry ride from Gran Puerto Ferry Terminal in Cancun and it is $16 per person for a round trip ticket.
Valladolid is a city on Mexico’s Yucatán Peninsula. Its colonial buildings include 16th-century Convent of San Bernardino of Siena, with an ornate wooden altarpiece, and baroque-style San Gervasio Cathedral. Casa de los Venados has Mexican folk art and furnishings. Cenote Zací is a sinkhole pool with stalactites. The underground cenotes of Samulá and X'Kekén lie southwest. Farther west is the Mayan site Chichén Itzá. There are Day trips through Viator that go here!
Tulum is further south than Cancun and is a laidback jungle beach town. There are beaches, jungle, Mayan ruins and more. Definitely worth a day trip!