I had thought cars were allowed on the ferries but I guess that is not the case.
Have you ever tried riding in the Pulaski State Park and George Washington management areas. Most of the dirt roads back there are for hiking or non motorized vehicles.
Some of the roads do allow vehicles but they are in TERRIBLE shape. I was camping there this summer and tried to do some riding but the roads are not maintained at all. At least not that easy with the stock tires and I didn't feel comfortable riding alone back there. Would be great mountain biking though.
I'd be down for a ride of some sort this Spring or this year if we hit a warm patch.
Local dirtbikers will ride around Pulaski and Lake Washington. I believe there are dirtbike trails that connect Pulaski to Elbow Rock, which is a combination of town land and private land next to Sprague Hill. Some of the roads are maintained for campers, but the DEM employees there typically ride around in trucks. Honestly, the park is more suited for dirt bikes, adventure bikes, and dualsports. West Glocester has better roads for road bikes, like Durfee Hill Road, Chestnut Hill Road, Old Snake Hill Road, and George Allen Road.
Towards Chepachet and Harmony, I'd recommend Douglas Hook Road, Cooper Road, Long Entry Road, Evans Road, and Tarklin Road.
Note that a lot of the back roads in Glocester have blind corners, sand, and other obstacles. If you don't know the roads, take caution. Especially when you add in the odd local in a pickup doing 50 down a back road at night. Roads in general in this part of RI are not in great shape but are great fun once you get off 44, 101, and 94 and away from the villages (Chepachet, Harmony, Pascoag, Harrisville, Nasonville, etc.). The police typically stay on the main roads and near the schools.
One route I'd recommend for a group ride is starting in Chepachet, going up to Pascoag, then to Buck Hill (Road), into CT, then Quaddick Town Farm Road, New Road, East Thompson Road, and then continue into Douglas, Mass - East Thompson Road becomes SW Main Street once you cross the CT/Mass border. Once you get into Douglas, you can either follow 96 back towards Harrisville or take 16 towards 146. E Thompson Road/SW Main Street is a nice straightaway and from Buck Hill to East Thompson (village) has decent corners.
There's also Foster but that depends on if you're trying to go towards CT, Coventry, or Arcadia, assuming you're not going towards Glocester or Scituate (I'm not aware of anything particularly interesting in Scituate).
I stop riding around mid-November and start up again in mid-March, assuming we don't have a balmy Thanksgiving or Christmas. Once the snow starts, I try to stay off the roads because of salt and sand until we see rain. I would like to take my bike into Boston before this year ends, just to get some nice photo opportunities.
For restaurants in the area, I'd recommend Tavern on Main and Aegean Pizza in Chepachet. Tavern on Main has been in business as a tavern since roughly 1800. Aegean makes a decent pizza. Glocester has at least
two vineyards: the Purple Cat (which used to just be a restaurant) and Mulberry Vineyards. I've had Mulberry's Cabernet Sauvignon and I liked it. Oneco, CT has Weidele's Pizza - I know the owner.
There's also Wright's Chicken Farm in Nasonville. Pomfret, CT has an excellent steakhouse that I want to try, Grill 37. I also would like to try the Publick House in Sturbridge, Mass, which has been in business since 1771. Finally, there's a vineyard in Foster that I wouldn't oppose trying and Black Pond Brews appears to be a brewery that serves beer to-go in Danielson. I'm not aware of any breweries or brewpubs in NW RI.