Toronto Band Trip Advice?

I'm going on a one night band trip next week and we're going to Toronto and its going to be awesome, but I don't know what to bring, or how much money. We're going to Wonderland (how scary are the roller coasters? is the Behemoth that bad?), and to see Mamma Mia on the Toronto Broadway in the evening, so we have to dress fancy for that but I don't know what to wear! We're also going to the Ontario Science Center. How hot is it in Toronto? We have to buy our own lunches at wonderland...how much money should i bring? Are there bathrooms on Greyhound buses?