there are 2 waterparks in
marmaris which is only a 10 min dolmus ride away
the dolmus costs 2TL per person from
icmeler to marmaris and around icmeler ie to the old village its 1TL per person
taxis are ok but some of the driving is very fast and either agree on a price before you get in the taxi or make sure they have their meter running

hope this helps
xxxxx