Forest Road (FR) 90 and 615 are both nice roads to ride during wet weather and for a more relaxed ride. There is some climbing involved but these climbs usually mean that you are about to get a great view of a valley or one of those nice long downhill runs.
Start at the FR 90 route 58 intersection. From here you can get on Fr 90, a gravel road, and climb to the top of the road to where the old fire tower used to be. This is a nice long climb but when you get to the top you will have a great 360 degree view. The fire tower is no longer standing but you can see the cement footers that the tower was anchored to.