Center Harbor has a little shops right near the docks, including Red Hill dairy, the ice cream place in a group of shops (can't remember the name), I think the Bagel place is still there, just to name a few. You get to go by Becky's Garden, a little rock island with a house on it. Always neat to see.
Moultonboro and Melvin Village not filled with boat accessible shops, but a wonderful ride, where you can get to the most Northern part of the lake, Lee's Mills, and Green's Basin.. Nice place for a slow cruise. Moultonboro Bay, Melvin Bay, can be good places to tube or just hang out. Go to the 19 mile store in 19 mile bay.
Seems like you have been in Wolfeboro.
Alton Bay: Pops Clam Shell, Shibley's at the Pier, Shibley's ice cream, JP China, Dockside restaurant (short walk from town docks), ice cream place in the Pavillion Condo's in the bay parking lot, Jay's mini-golf, and Fireworks on July 3rd and Old Home weekend Saturday night. The big booms echo and re-echo off the hills surrounding the end of the bay (our cat disappears for two days after the fireworks and we live a mile from the fireworks
),
Other than than, not much to see on the northern or eastern end of the lake.
We love getting out to the "other end of the lake" and then as the day is winding down, taking the nice leisurely cruise back home to Alton Bay.
Hope this helps, and enjoy your time on the lake, where ever it may be.
