Niagara Falls: If you can go to Canadian Side, go there. There are a lot of stuffs to do (I have not been to the US side). Gambling is big out there if that interests you. Some engineering marvels you might want to visit are Behind the Waterfall Trip which takes you behind the walls of waterfall, Whirlpool trip which is a gondola ride above whirlpool of Niagara river, White Walk takes you on a boardwalk along the high current of the river. I might have missed more but those are some of trips that impressed me on my trip. Toronto is another 1.5hrs drive from there if you want to stack up cities you visited. I'd say go for it - that city has completely different charm. It looks like one of the US cities but it has different vibe to it.
Driving South to Boston: Go to Fenway Park - grab a beer at Boston Beerworks and enjoy rest of the day hanging around with the Irish Southy. If big colleges and university interests you, go to harvard and MITs - try polishing shoes of Mr. Harvard which btw is not the real Mr. Harvard. Go visit Harvard Sqaure to get the feel of revolutionary war - its the location of Boston Massacre.
Providence, RI: Not really sure if there is anything to do out there. I have been there only once for couple of days. It used to be old port city - not sure what its current economy is. The downtown mall is nice though which stands above the historic canals. Ohh there is this italian street - i forgot its name. Good Restaurants. Expensive. Built in mind with Italian Mafia heritage of the City. Worth a walk.
New York: NYC - either you hate it or you love it. If you like walking, like not smiling, like giving shit to people, like cheap stuff, like expensive stuff, like chaotic but organized city - NYC is for you. I found it very very chaotic. I didn't like it. However, it is worth a trip in ones lifetime. Palin claims it to be unreal America, i'd like to go step forward to claim it REAL WORLD. I don't think i am wrong if i say NYC has people from all over the world - if Artic and Antartica was a country NYC will accommodate its citizens. A lot of stuff for you to do but don't miss out on South Asian Community in Jackson height, Little Italy and ofcouse the SoHo neighborhood.
Baltimore, MD: don't go the projects and be safe. Inner Harbor is the touristy place in Baltimore. Good restaurants - Tryout seafoods just for sake of experience. Even if you hate the food - you will love the experience.
Ocean City, MD: I like OC. Seacrest is nice club. Although it is still too early to go there now. When do you plan to leave? A lot of nepalese students- very friendly. I'm sure there will be a lot of sajhaites who can get you hidden secrets of OC.
Washington, DC: The nations capital. Although you didn't want to go to any museum, go to museums in DC. WHY? because they are all free. Take a day out from you busy itinerary to walk from US capitol to the Lincoln Memorial.
Dude, hope it helps. Safe driving. Don't drink and drive. All my best wishes are with you - don't get any tickets. :p.
Disclaimer: yo trip ma bhayeko location haru ko sabai malai mann pareko location ho. Kasailai mann naparema tyo samyog matrai huna sakcha. Yi mathika location bahek yi sahar haru ma ghumne thau haru dherai chaan. Mero Dui sabda.
