Thanks to ACD info, I've managed to snag a houseboat not too far from Siberie - which looks like a top spot. The missus is not much of a smoker, but is happy to be dragged around the coffeeshops for a toke or two while I disappear in a cloud of smoke.
I thought to make life a bit more interesting for her, I might grab one of these fun2go tandem trikes from Star Bikes http://www.starbikesrental.com/bikes.html (sorry, don't know how to upload a pic...
I've also sent the company a few emails to try to book one of them for the time I'm there, but no-one seems interested in getting back to me. Is this a common thing?