Shameless plug, but stop in at Winter Fox in Sandy, first shop on the right, brown wood building, we're nice people and know some stuff. That said, the place Scheissami references, Mirror Lake trailhead currently has no parking, because ODOT, or whoever pushed snow into that area when clearing the roads. White river is pretty flat and you can go as far as you want. Trillium lake is groomed, but a lot of people still go there to snowshoes, and is a loop around the lake, with one steep hill down to the lake.
Barlow pass is cool, and you can hike to either frog lake, or twin lake from there, or if you continue down 26 can access them from other trailheads.