Hi Daisy Mae, I'm Marsha, now 71, but have had my ileostomy since I was 15. After I fully recovered, I did all the things I wanted to do... some easy, some not so much. I was a "teen" so I didn't prepare all that much. I dated, went skiing (a big flop and couldn't get up=weak stomach muscles). Learned to ice skate... where I often "flopped" as well. Thankfully, the rim around the ostomy appliances, back then, kept me safe. Through the years, I water skied (and also flopped), not really athletic, but did snorkel in the Caribbean, and in Australia on the Great Barrier Reef. In Israel, I went in the Dead Sea, and didn't plan for the consequences of the highly salted water... forcing my pouch to detach from the wafer. What a mess. I didn't plan for that either (foolish gal) and didn't have spare supplies, but a shower and tape solved the problem.
As for white water rafting... that was on my bucket list for years, and I actually got to do it on the Snake River in Jackson Hole, WY. Again, I didn't "plan", but was concerned about getting into a suit. I knew it would be tight (and I was chubby) but I went for a size bigger than what I would generally wear. I didn't eat much the night before, or early that am, so I knew output would be less. I was just careful about pulling on the suit, so I didn't pull off the pouch. Once it was on, I was set. I chose not to sit in the front row because (I wasn't that confident in my ability to help direct the raft) and I chose to sit on the left (w/ ostomy on my right side) so I could easily lean against the side of the raft for balance, and without worry. In the end... all worked out well, and I would have done it again and again, if the opportunity presented itself. Just think it through, and unlike me (plan) for any possibility you can think of. And then, as the song says... "Let it Go" and enjoy the experience. I've found that when wearing the appropriate appliance, the stoma is "practically" indestructible. Best of luck... Marsha