Here's a few east coast (sorty of) jumping options;
1) water ramps
Lake Placid: not open to the public you've got to go with a USSA camp. these guys run camps
http://www.freestyleamerica.com/ramploc1.htm
CNAYL/Le Relais, QC: Open to the public or go with a camp like D Splash
www.acrobatx.com
www.d-splash.com
Ohio Dreams water ramps/camps www.ohiodreams.com
2) Airbags.
As of right now BBTS (Waterville Valley) is planning on installing a set up at Snows Mountain (Waterville Valley). They just got approval from the town. No other info yet. The likelihood is they'll open as a camp (not public)
http://wvbbts.org/bagjump/
Gunstock, NH: About a week ago Gunstock said on their facebook that they were planning on making a dryland set up for their airbag with details to come. eta july/august. This will probably be public as it was public in the winter
3) Liberty Mountain Snowflex Centre: about 11 hr drive from Boston but amazing for jumps and rail/boxes. about 150 vertical. great for progression as there's padding under the Snowflex. Also, the jump tranny is super long...seen many dub's..check out lots o' threads and vids on NS. Super for progression also really cheap and the people are really nice.
http://www.liberty.edu/snowflex/index.cfm