Although the bus ride to the caves is a long one (1.5 hours on each direction), the tour itself is beautiful
We went to Playa Mia beach break (with lunch). The beach is quiet. Didn't feel crowded at all (although there were 6 ships at port that day). Clean. Lunch is nice. Pools are excellent (there are two slides too).
Just walk to the beach, and spend the day there.