The boat is perfectly safe for the kids my bay was crawling around under the shad on the top deck if that gives you some idea, they will give you lifs jackets if you want and they can have them to swim in thats what my son who was 5 at the time did and my neices.
No entertainment with Mustafa but plenty of stops for a swim then lunch to occupy them our kids just sat looking over the sides, swam at every stop on pancake island they can get off and walk along, you could always take a game or something for them gameboy if they have one?
The FC one does have kids reps on with music face painting etc so if you are worried they would be bored maybe that will be better we just thought that might be too crowded and we didnt fancy listen to the mimic man song allday!!!!!
I wouldnt have thought jeep safari would be any good for 3yr old be Mustafa would be the best person to advise he game me good avice about what trips to do and not to do with the baby.
Vicky