The Sandwich Notch is a hidden gem in Sandwich that features hiking trails, ample rock climbing/bouldering opportunities, and features a waterfall - Beede falls, with plenty of area to swim. Dogs are allows to use the area.
Right above The Prudential.
Easiest way to get there is to go to the far left end of Yellowknife Buttress and walk left across the gully. It is hard to maintain a trail here due to the flow of ice and rubble that comes down the gully seasonally.
A pleasant, low-key, bouldering area located by a small waterfall on the Isinglass River in Gonic NH. Problems currently range from V0 to V5. Parking for the trails is located on Rochester Neck Road, Rochester. Yellow trail, ends near water.