I'm off to Belgium very soon with a mate and a borrowed Garmin. Just wondering if there are any sites that have good routes available as gpx files? I've found http://www.fietsroute.org/ but it's difficult to judge what sorts of routes they are. Something with some general comments about the routes from the riders who uploaded them would be great.

Myself and the guy I'm going with are both experienced riders, so looking for some routes that are quite testing - not afraid of the bergs and the pave (yet).

Any ideas would be great, thanks.