Yeah, the weather here is normally pretty good, although it's a little hot at the moment, we should get a break from that before summer hits.
First. If you haven't already, drive west out Highway 30, and head up Germantown road (about a 1/4 mile past the St. John's Bridge). There's plenty of trailheads up there. Unfortunately, most of the singletrack is labeled hikers only, although I have occassionally "missed seeing" the signs. The doubletrack is scenic and a good workout.
There's a little bit of more technical stuff at Powell Butte to the Southeast, and I'm told there's some pretty good riding up around Mt. Hood, which hopefully I will have a chance to check out this summer.
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