Yes!!
You may not feel like it for a few months after surgery...but you can do all those things and more!
I boat all summer and use a Sure Seal over my wafer (you can get a few samples here:
www.alpglobal.com). They are waterproof and breathable and protect the edges which, for me, gives me a few more days of wear time per wafer. Other than wearing a tankini with a skirt bottom I don't do anything special when I go to the beach and I don't do anything different for amusement parks.
Good Luck on the 21st and let us know how it goes.