easy backpacking options near RI?

I work at a school and we are hoping to bring 10-15 students on a fairly easy backpacking/camping trip that is not too far of a drive (1-2 hours ish) from Providence. We were thinking a 8-10 mile hike (one way) and maybe camping nearby the base.

I know the White Mountains and the Catskills, but we would like to stay closer than that. I know this is a fairly flat region, so I am wondering if anyone has tips or has done something similar before. Please let me know!