Roller coasters = Busch Gardens and Universal Islands of Adventure. Everything else is meh roller coaster wise in FL. Plenty of interesting places to camp, not just the Everglades. Jenni Springs, Silver springs, and several other springs are fun places to camp. There are campgrounds at Zephyrhills I think too. The suburban sprawl and lack of decent public transportation in FL is troublesome. Orlando has buses, and I never enjoyed the Lynx system much near UCF. It worked when I didn't have a car though.
It got to 80 degrees today, which is something I love. I can see why as a Canadian that would bother you.