We are a family of 5 that will be going to Sandos Playacar march 26. My kids are 3, 5, 9. They love the beach and love to collect shells. Are there any places we could go for half a day that they could do this? We would like to take some day trips but I am not sure if they are too little? they cannot swim well so scuba and the like are not options for us. What about port aventuras? thanks so much.