I've never boated down the River Wey but I've walked it a few times as I live near Guildford. Can tell you all the best pubs and some beauty spots nearby...I don't know what you're into but here are some of the things I've enjoyed...
Must-booze pubs: White House in Guildford, the New Inn in Send, the Talbot Hotel in Ripley, the Cricketers in Farncombe and the Red Lion and the Star in Godalming.
Must-sees: Guildford itself is great for shopping and has a museum, castle, cinema, 2 theatres, good live music scene - and there's a 17th Centrury treadmill crane at Town wharf. Dapdune Wharf has a visitor centre - very interesting place and good to take the kids. St Martha's Hill is a good walk near Guildford - magnificent views, a very special place. The Godalming Navigation is very beautiful - Catteshall Lock, Farncombe Boat House (with horse-drawn boat Iona), Godalming museum and the beautiful medieval streets of Godalming are well worth a visit.
Good website: http://www.weyriver.co.uk/theriver/
Enjoy!