I second driving through the notch. There's a nice loop you can do that'll take you through Franconia notch and Crawford notch, to Conway, then down through the lakes region. Probably about a 3h loop if you don't stop but there are areas and short hikes scattered all around that loop. If you do go up to Franconia notch, a classic touristy thin to do is to check out the basin (cool water feature, not quite a waterfall) and the log flume. The polar caves near attitash are a fun little spot too. Attitash also has a Mt coaster but I'm not sure if it'll be open by then, with any luck they'll still be skiing.