I'm kind of frugal but this is one experience you'll want to shell out the $30 entry fee. Excellent performances by the actors make you part of the experience and you learn a ton about the history, you tour the boat, there a vial of tea from that night in 1775 there and a very Hogwarts-like moment (I won't ruin the surprise). And for $4 you can taste all the teas that were thrown over that night. I never knew George Washington drank green tea!
We had such a good time (and are history nerds), we went back for the Tavern night which they hold 1-2 Fridays a month. Tavern night is typical colonial dinner (ham, chicken legs - it was tasty) cash bar colonial drinks, riotous rebellious talk, music and a dance or two. Great night out for singles, couples and families.