A couple of us Maine C-Brats cruised Narragansett Bay Sept 22 –24, 2016. It’s a fun cruising ground with lots of variety. If you earlier the swimming will be ideal. Sea Water temp was 70 degrees when we were there.
I recommend you pick up “A Cruising Guide to Narragansett Bay and the South Coast of Massachusetts “ by Childress and Martin. Although dated, it has all the info that doesn’t change.
We launched at Colt State Park in Bristol RI which has free overnight parking. Unfortunately, the ramp is exposed and was hard to load the boats in waves. So, I’d look for another ramp.
If you like beach combing on sandy beaches, there are a few you can beach your boat on. You can cruise by the backside of the Mansions and tour Newport. There are some quiet anchorages. We couldn’t find a way to get off the boats in Providence as the water was too shallow to get to the floats.
The only Marina we stopped at is Norton’s in Greenwich Cove. It was very accommodating, has everything you need, and is $2/ft.
Rick from Maine