Providence's RIPTA bus system actually covers most of the state. Besides the Providence area buses there are also routes in Pawtucket, Woonsocket, Narragansett, and Newport, and routes connecting all those cities to Providence. At $1.25 a ride, it's quite a deal to reach anywhere in the state. During the summer there are beach buses from Providence to South County. Also during the summer, on Ozone Alert days, all buses in the state (except the beach buses) are free.
Some of our buses however have seen better days. Replacing the fleet is a high priority for RIPTA right now, and doing that without raising fares is a challenge.
In Providence and Newport RIPTA also runs trolley bus routes to area attractions. I think the Newport trolleys may be seasonal, but the Providence ones run year-round. Here in Providence the trolley buses run on 2 cross-town routes. I use the green line frequently to get from my house on Federal Hill to the East Side, I also ride it to work when I don't feel like walking. Best thing about the trolleys, they're only a dollar.
RIPTA also has a seasonal high-speed ferry route between Newport and Providence, making the trip in under an hour, which beats the bus by a wide margin during peak summer traffic times.
There is also one GATRA bus route that runs from Attleboro, Massachusetts into Providence. We also have commuter rail from Providence to Boston which is slated to be extended further south into Rhode Island.