I am staying near the ferry to Isla Mujeres and want to know if it's more cost effective to simply organize a visit "a la carte" versus a package. I would like to visit Garafon Park and do a "swim with the dolphins" -- but only my 10-year-old daughter wants to swim with the dolphins so I don't want to pay for pakages for me and my husband (and I don't think my three-year-old can even do it). Is there any way to just arrive at Isla Mujeres and wing it? Or are these things far away from each other and all by reservation only? Any suggestions most welcome! I'd ask at the hotel where I'm staying but I'm sure they'd recommend a package. Thanks!