I was just going to say that until I read your post. The river is a unique feature, not many towns have one running through the centre. I think open up the river and pedestrianize both sides with terraced bars, cafes, restaurants, specialty shops. The river can be dredged, no reason why water taxis similar to Amsterdam cannot run between Paisley and Glasgow. In fact to and from anywhere on the Clyde. If Paisley really wants to attract more people, it has to offer something really unique. The river holds the key.