Hybrid bike rentals (Rockville/Bethesda area)

I like my road bike a lot and actually my least favorite part of riding is on narrow trails.  Although I noticed there are some wider trails in the area that are suitable for a mountain/hybrid but not really suitable for a road bike.  I figured it would be a diversion to try these trails but I don't want to buy another bike just for that purpose.  So I was thinking it would be nice to rent one for the day on occasion.

 Anyone have any recommendations?