I live in NH, and if you're making a long trip anyway you should consider Quebec. The people there have a reputation for being really hostile towards English speakers, but I think if you're from Texas you're probably excused. Quebec is really different, whereas the rest of Canada (ok, get ready to flame away), well, let's just say Quebec is really different. Montreal gets most of the attention, but Quebec City is definitely worth a trip. The Maritimes and Newfoundland are very cool too, but a little more laid back. Picture the Gorton's fisherman (do they have him in Texas?) playing the bagpipes. My personal favorites are Newfoundland and Cape Breton Island (the way out part of Nova Scotia), but I'm not sure what there actually is to do there.
To all the Canadians out there:
I meant well, it just didn't really come out sounding that way.