We are a family of 5 and will be doing our first Disney cruise. Kids are age 7, 6, & 4. We don't want to do expensive excursions through the ship. What is there for us to do at the port? Can we just get off and find a beach or things to see within walking distance? We have our own snorkel gear...is there an area that we can snorkel on our own near he port? Is there a nice area that we can take a taxi to (either to walk around or to snorkel/beach)? Any tips for Cozumel would be great. Thank you!