As many of you may already have figured it out from simply reading the title, the inspiration to undertake a raft trip came to me when I first read Huckleberry Finn many years ago. I am a young adult now, but the idea still fascinates me and I very much want to go on a river trip in similar fashion to Huck and Jim. So I am looking for a river that satisfies the following criteria:

1. I could float down it for at least a week or two.
2. Has towns or villages dotting the shore so that I can get off at certain locations along the river.
3. A raft is allowed on the river.
4. I would prefer it to not have a lot of commercial traffic.
5. I would prefer the river to be in a place that I could visit (or obtain a visit visa to) with either my Canadian or Pakistani passport.
6. It would be a plus if the river flows through places that are culturally different from one another.

So why not simply choose the Mississippi? An answer on this very site recommends against it. Therefore I am looking for an alternative river on which a journey such as this would be feasible. I know stack exchange sites demand that users ask questions that are as specific as possible and I tried to make my question as narrow as possible. I am open to any suggestions to make this question better.