If you're looking for a thrilling adventure in the water, try white water rafting. We went to Wilderness Tours in Ottawa and did the Classic Express Trip. The trip offers the opportunity to swim, cliff jump and raft through rapids!
A few notes:
Remember to wear clothes you don't mind getting wet and can dry quickly.
Water shoes or sturdy sandals are ideal because you'll have the opportunity to cliff jump into the river.
Ask for Bernie! We had him as our rafting guide and he was really fun!