When will you be here Will? If you have time, travel up to Granite Falls, WA and day hike Goat Lake, Monte Cristo (mining ghost town), and the Ice Caves. All are in low enough elevation that the trails should be clear of snow. All of them togehter can be done in a day if you drive to all three trailheads (all within 10 miles of each other).
If the snow is gone (not yet), drive up to Chinook Pass and hike southbound to Dewey Lake. You can incorporate the Tipsoo loop into this hike. This is higher in elevation but if you are here in late August the temperatures shouldn't drop below 40*.
As mentioned, Leavenworth is a dayhikers/backpacker's paradise. Besides the charming Bavarian town, there are white water rafting trips, fishing guides, etc.