John Adams was an amazing figure in American history and was instrumental in forming the Country. I'd highly suggest reading up on him. David Mcullough wrote a fantastic book, John Adams a few years ago that was atop the best sellers list for most of the year.
The Uniterian church in Quincy Center houses the tombs of second President John Adams, his Wife Abigail, and their son and 8'th President John Quincy Adams. they do offer tours.