There are good rides and climbs that you can take near Spring Valley. I'd recommend bringing a road bike. You can take Jamacha rd heading east, and take hwy 94 and from there you have a selection of climbs to choose from (about 12 kms long) and good rides with not much traffic. Let me know how long you are going to be around here and I can point you to a couple of routes depending on the length of the rides you wanna do.