Aquashoes are a great idea - small, light and unrestrictive. I use them when teaching in summer. Wetsuit boots are good, but a bit over the top for just canoeing. For the walking, obviously decent walking boots are a must.
Sandals are great for the camp, and a great relief from boots, but I have found them pretty useless for walking in rivers. They tend to slip around on your feet and take a long time to dry.
Excellent advice there on clothes Phil :biggthump
Inflatable canoes?? New one on me! I'd be a little concerned about their durability, but we need all the ideas we can get I think!