Step 1: Ride the Washington Secondary Trail to Summit General Store. Get yourself a coke because you climbed 75% of the way to the highest point in Rhode Island.
Head south on Log Bridge Road and follow the tracks between the jersey barriers where the road ends. With a few short exceptions popping through cul-de-sacs (don’t worry, it’s basically a straight shot south) and the like you’re off pavement for the next 13 miles. Then you’ll hit the trifecta of Wyoming, Moscow, and Hope Valley before you duck under 95, cool off in Wood River, and hit Kenyon Hill Trail.
Kenyon Hill Trail is more great gravel so enjoy it! You’ll have to zig-zag through “downtown” Richmond (RI’s least densely populated town!) to get up to Punchbowl Trail. The first mile of the trail is a track in the woods but the second half is a tiny asphalt road ending at Kenyon Grist Mill- a Rhode Island institution. Then it’s just a short hop on 138 (mostly empty and easy for biking here) to West Kingston.
Now you have options! Take RIPTA Routes 62 or 66 back to Providence. Hang out in Wakefield/Peacedale a bit and take the 66. Ride up Route 2 to Wickford Junction and catch those same routes. Or, for the greedy, ride back into Providence. If you want to loop in a brewery tour the route ends at Shaidzon, Sons of Liberty and Whalers are in Wakefield-Peacedale, and Tilted Barn is just up Route 2 in Exeter. Take the bus home if you hit them all.