You should have a great time.
For eating you are spoilt for choice with an endless list of restaurants lining the promenade and the main road to the beach.Take your pick - Turkish, english, italian, chinese - they are all there.
Of course for the son there is the waterpark which has plenty of space for you to relax.
Plenty of shopping in and around Calis (Fethiye) and everything else including great selection of beaches are only a Dolmus (Bus) ride away
Hope you enjoy it
Steve