we went for the first time last year and we loved the jeep safari and a boat trip. we had a 4 year old and a 2yr old and they had great fun on the jeep safari especially the 5 year old when the water pistols came out.
a visit to the waterpark ..good day out for big and small kids alike..a wander round icmeler market just for the experience think its still on a wednesday..all the trips already mentioned..what ever you decide to do you will love it cos its icmeler..enjoy
Hop on the dolmus and take a run into Marmaris for the day - there's a good market, lots of shops and the big covered bazaar. Food's expensive on the front but walk a street or two back from the main drag and you can find lots of little cafes that are lovely and reasonably priced. Take the water taxi back - lovely and refreshing if you've been on your feet for a while!
Jeep safari is a must very good fun day out! The lazy day boat trip is good too however i would check when you book that they don't overcrowd the boat as sometimes i have been on boats that are so full you have to sit underneath out of the sun. Boat trip to dalaman/mud baths and turtle beach is a good day out too. There is also quad biking and that but I've not tried that yet maybe this year