what do you think, maybe the best combination at all, at least for urban purposes: Inline skates an Packrafts.
We have smooth paved cycling routes along most of the major rivers in Germany. I went on a Sunday afternoon trip upstream on skates and returned as drift wood on the river Elbe in Dresden.
This would also work on creeks and small, little trafficed secondary roads.
I didnt do any skating pics, but the pack was know hassle. With sticks, one is as fast as cyclist, but doesnt have the bulk

In my Llama, I could even leave the skates on.
http://picasaweb.google.de/sven.schellin/Rollerboater#
Sven