Visit the Mayan ruins, swim in their gorgeous bright blue waters, go diving in El Gran Cenote – an underground cavern, and go snorkeling in one of their spectacular swimming holes. Playa Paraíso beach is still free, as are many of Tulum’s shores, so you can save money. Archaeological sites such as the Sian Ka'an Biosphere Reserve, don’t charge much at all. You can find deals for under $80 in January and February, and flights are under $300.