Day trips (i.e., 2 to 2.5 hours) to New Hampshire from the outer southwestern suburbs of Boston constitute the majority of my ski season.
Recently, I went to:
Gunstock on 3/2,
Tenney Mtn. on 3/14,
Sunapee on 3/15,
Loon on 3/21.
(Waterville Valley will be next; probably going to skip Ragged this year).
All have lots of good snow (and it's snowing, not raining, up there right now) and are very enjoyable.
Sunapee is the closest. Nice cruisers, good lifts and grooming, beautiful views. Can get a bit crowded, but I think it's your best bet. Head over to the Sun Bowl area in the morning, and eat lunch at the summit lodge if it's open.
Tenney has old lifts, but decent vertical and intriguingly quirky terrain, and there's usually hardly anyone there. (Ragged Mtn. is similar with less vertical, but a few minutes closer.)
Loon is the biggest, with some impressive terrain, but is surely the most crowded. (Waterville is also pretty big.)
Gunstock is OK, too - not my favorite, but my 13-year old son liked their terrain park a lot.<FONT size="1">
[This message has been edited by Tominator (edited March 22, 2001).]</FONT>