Hi there,
There are municipal parks dotted around
icmeler for the younger kids.Some of them are in need of attention though!There's also the Aqua Dream and Atlantis water parks in
Marmaris just a short taxi ride away.
I prefer the Aqua Dream (were there in june with 2 girls aged 8 and 5) They both loved the slides.(there's a section just for the little one too!)
ICR travel can let you know the rest.
Enjoy