After fiddling about with Micro Peli boxes to house TZ Lumixes over the years, and still worrying about splashing, in the end I decided a waterproof camera was the way to go. You can just hang it round the neck, forget about the water and concentrate on the pix. I got a Lumix FT2 and a mate's used the similar but more bulky Canon D10 for over a year. Having said that, I was never convinced the Peli would have stood a long submersion, but it would be easy to improve the seal. And it’s a lot more accessible than an Aquapac (like an Aloksak AFAICT) which I feel you seal once for a trip, rather than expect to open regularly on the water.
I also have an LX5 which is a much better camera than the above two. I’d use that on a trip where getting really good shots was part of the goal. Unfortunately I’ve made my LX5 less compact by adding the screw-on protective lens housing tube (more against dust drawn in by zooming than water). On the water I’d settle for the inconvenience of an inexpensive sealed, clip-top lunchbox (tupperware) and hope for the best, while relying on the FT2 in splashier conditions.
In my opinion, above all a camera must be accessible, but paddling a deckless packraft or a solo kayak on a fast river has certain limitations.