Not in RI but there's a spot I absolutely love in Wrentham. Wollomonopoag Conservation Area. Down towards the end of Elysium St in Wrentham there's a small parking area with a trailhead. Short walk to lake/marsh area with lots of herons and other wildlife (swans, ducks, owls, beaver/muskrat, etc etc). Not a difficult trail but expect some grades and rocks and tree roots, encroaching brush, muddy parts... Can be buggy particularly in warmer weather.