Riding under overpasses on the initial 10-mile loop, everyone whooped and hollered (video).
At the first rest stop, in Arnold Arboretum. Above, a volunteer throws snacks to bikers.
Riding through Stony Brook Reservation on the 50-mile loop.
On the return stretch, on the Neponset Trail.
Back at Government Center (at the Landry's Bicycles tent), a boy rides a stationary bike, powering a blender to make smoothies.