My husband and i booked a cruise last year before knowing that we were going to buy our house that same week. Needless to say we were broke, and didn't have much money to spend afterwards. We went to Cozumel, and rent a mopped for $25, and explored the island. We went to chankanaba and had a blast paid $8 each to get there. With the mopped we were able to get back to the cruise and eat, it's only 5 minutes ride from chankanaba. Plus we had the opportunity to explore the island side to side, and site seeing can be counted as another excusion. We even saw some Mayan ruins in our drive. We had a blast, and under $50.