Things to do in Toronto?

I moved to Toronto in 2001 and have been living here ever since (7 years!). City living is great and there's never a dull moment but I'm looking for new activities and wanted to create my very own "bucket list" which is a list of things you want to do before you die. Any ideas? Some of the things I've recently participated include:

Sports & Activities
- CN tower climb (twice)
- Co-ed soccer with the TCSSC (Toronto Central Sport & Social Club)
- Lululemon scavenger hunt
- Great Neighbourhood race (United Way)
- Curling in a league
- Skating outdoors at Nathan Philips Square
- Skiing at Blue Mountain and Tremblant

Volunteer Work
- Out of the cold program (serving dinner to the homeless)

Social & Activities
- Operanation (fundraiser for the Canadian Opera Company)
- ROM Young Patron's circle
- Going for movies
- Cruise

I'm interested in trying other activities like:
- Fencing
- Indoor rock climbing
- Running a marathon
- White water rafting
If you have any suggestions, drop me a line. Thanks!
Alyssa