Great Northern is also good.

In all honesty, this is a pretty broad New England Itinerary. Rhode Island has some really special local foods and some wonderful local restaurants-- if that's in any way your thing then I'd just see what is in your interest. Great Northern is also really solid, but I'd also recommend you branch out to stuff like seafood that will probably be more unusual for KC.

That's just me, though. This itinerary is pretty touristy (which is fine) and a lot of time on the highways, but locally we have a ton to offer if you want suggestions. I'd recommend wickford village, pastiche and federal hill, and a walk through downtown areas like the pedestrian bridge. Brown, Hope st., Benefit St. are all beautiful to walk around, especially this time of year, and the Colonial homes are so colorful and unique.

edit: wickford is about 30 min south, but you seem to be looking outside of PVD