Deb, WerT and Jeff are right to caution you about the perils of carrying optics aboard a small boat. I do it for a living -- shoot pictures from boats, that is -- and writing about such topics is my job. I've taken my camera gear in some terrible whitewater and on tidal reaches in the wind, and always ship some water, even if capsizing isn't always in the cards. The key is to keep your optics dry, of course, and also be sure to secure the box into your boat underway. My preference has always been a military surplus ammo can padded to take my gear. Wrote about it in "
Refitting an Ammo Can as a Camera Box."
If there's a military surplus outlet near you, you have time to get an ammo box/can (they're usually cheap) and be sure it's waterproof by testing it. There are commercial waterproof boxes and bags, though I don't fully trust soft bags. Check a paddlesports shop if you have any near you. If you cannot get a waterproof box before your trip, don't risk your good optics. Take your Optio, and for insurance, tuck it in a heavy duty ziplock bag. Make sure it's lashed to you or the boat, too. Just in case.
If you can't get a waterproof box/bag for this trip, look around after you return and get one so you're ready for the next trip.