NH has some great places too… It’s kinda the off season though Mt Major in Alton is good, there’s the Fox State Park (I think it’s Fox, I haven;'t been in years)… There are some mtb sites that go over trails. I have a book of mtb trails for NH & Maine, but alas, it’s packed in a box somewhere…
You’re asking a practically unanswerable question. I’m sure there are lots and lots of good places to ride. Look where the major mountain ranges are, and you’re bound to find something good there.