A recommendation on other spots depend on what you're looking to do, mostly protected flatwater (lakes and protected inlets), rivers, or more ocean paddling. I'd definitely recommend a paddling clinic depending on where you want to go. I've worked for two really really good outfits both in MA. Osprey Sea Kayak Adventures out of Westport, MA can help you with just about any ocean paddling you're looking for, and Zoar Outdoor runs awesome whitewater clinics and classes. I'm not working for them currently and thus, not connected in any way, I just had a really great experiences with both and would recommend them highly.
That being said, if you're looking for more ocean paddling, take a look at the Maine Island Trail. Many of the passages from site to site can be hazardous depending on tides and weather (fog), however there are plenty of others that are just a short paddle from a small harbor, and all of a sudden you feel like the only person on the planet. The MIT was my first experience sea kayaking and was absolutely spectacular, if not a little higher-risk (myself and a friend, both in high school, having never sea kayaked before, with lots of whitewater and backpacking experience...)
For river paddling, you might look into the Alagash. I haven't done it myself yet, however everyone that I've talked to about it has raved of its solitude, beauty, and mosquitoes. From what I've heard, it's the closest thing New England has to the Boundary Waters in Minnesota. I haven't done too much research, but aside from a few sections, you might consider a longer trip along the Connecticut River that forms the border of VT and NH, then down through MA and CT...I think there ought to be some good downstream (non-technical) paddling to be found so long as you can find campsites from point A to point B and a shuttle isn't too bad.
Good Luck!!
Cheers,
West