We love love Paradise Beach - my kids are 10 and 14. Chankanaab and Playa Mia are also good if you think your girls will want more than a beach and pool. Paradise does have those big inflatables in the ocean, but my kids (especially my 14yo girl) don't like how much work it takes to get on them so the additional cost was a waste of money for us. Cozumel has an Amazing Race that is based on the tv show which you could book through their website https://amazingcozumelrace.com/