Riley's Lock either upstream or down is a nice ride, though it can be crowded. Depending on how much driving you guys want to do, we could start farther upstream.
What are alternative starting points?
I'd rather be swimming...biking...running...and eating cheesecake...
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2008 Cervelo P2C Tri bike
2011 Trek Madone 5.5/Cobb V-Flow Max 2007 Jamis Coda/Terry Liberator
2011 Trek Mamba 29er