Hi Angel, I guess this post is too late. But just in case you check..I can Highly reccomend Chankanaab Park. Taxis off the ship are cheap and it will be listed on the board where the taxis are..use to be $6-7 a few years back for the ride..not per person! Park fees have increased but are reasonable. It is truly beautiful, you can beach or snorkle and they have lockers also. They have dolphins to swim with for a fee..but it is just fun to watch, also a dive shop for beach scuba diving which you need no certification for. It is a government ran park, and my pick for most Bang for the Buck! I will attempt to include a link.
Hope you are having a wonderful cruise!