Entertaining kindergardeners??? Help please!?

My little sister is having a “Hula – Bug Out” Birthday at the end of the month. Hula as in hawaii, tropical theme and Bug OUt as in bugs and safari stuff. I know its weird, but that’s what she wanted and she IS the b-day girl. I ended up being in charge and I need some ideas for how to entertain these kids!! They are all 5 or 6!
So far I was thinking of having different stations cause there are about 35-40 kids coming…

Guy coming with a bunch of exotic bugs
Cotton candy machine, pizza, chips. etc.
crafts station
and that’s it.

Any Ideas??? Thanks!