Wow, your first time to Icmeler, what a treat you and your daughter are in for!
Assuming you both swim, the boat trips are brilliant, and still fun if you don't. You must do a Jeep safari, expect to get very wet, very dirty and don't forget the water guns!
Take a look at
ICR trips
http://www.icmeleronline.com/icmeler_excursions.php for a really good selection of trips.
The staff in the bars and restaurants are all geared up to keep the kids entertained so that the parents can sit back and relax.
Oh, and be prepared to read a lot of replies to your question. The
Icmeler community here love nothing more that helping newbies.
Tim