We went to Isla for the day last year and loved it. This year we are returning to the area with our kids (7 & 10) and were thinking that would be a good day trip for us. However last year we were staying in Playa Mujeres so it was pretty easy getting to the ferry. Any thoughts on how long and how much money it would cost us just to get to the ferry from the Iberostar resorts? Thanks!