www.mccycleandsport.com in Laconia has scheduled group bicycle workouts where bicycle people go pedaling in a group around Lake Winnipesaukee and the Winnipesaukee River.
Ditto that for
www.rhinobikeworksnh.com in Plymouth that's closer to Squam Lakes, Newfound Lake, and Rumney Rocks rock climbing cliffs.
"Click to view the Rhino bike rides" in the Group Ride Schedule is your link to an excellent list of suggested rides with 13 DIFFERENT MAP ROUTES complete with distances and details.