>>any floats out there that would fit this trainer its a 20 size hobbico supperstar. <<
Everybody who offers floats offers a .20 size. Usually these are about 28" long. Sometimes they are sold by the weight of the plane. Float length=3/4 of the length of the fuselage is the guideline

>>Also when should I fly if the lake neat me (lake geneva, Wi.)is quite busy. should I just get up at water skying time(6 am) to go flying? <<
Use the same rules that you would at an AMA field for flying over people. If nobody is going to shoot you for firing up a model engine at 6 am, then that would probably be good. Right at dusk is usually pretty good, too. Some wake action on the lake is not bad for flying, as long as it is not "too" choppy. If it's too busy, it's dangerous to fly over people, and somebody may run over your plane when you land.

>>As for a retrieval boat, I no longer have my boat docked at this lake but would I be able to carry the plane on my waverunner?<<
I have seen it done. Waverunners are not as good as a rowboat for carrying "fragments", so throw a trash-bag into your waverunner's storage bin, in case of a crash.