My family (with 8 year old) did the tour with both ruins and beach break at Playa Mia and we all found the ruins to be the highlight of the tour. The beach was not much of a swimming beach (lots of seaweed last March) and the water slides were not in good working order (i.e., you had to push yourself down). I think it depends what you like. The ruins tour had interesting history. The ruins themselves weren't as spectacular as Tulum, but do a web search to see photos and then decide.