Breakneck Ridge is open again after a year of trail repairs. Stunning views, sore legs maybe. Definitely worth a drive. On weekends, go early in the morning to avoid the crowds of Cub Scouts and Girl Scouts. BTW, there is a Dunkin about a mile from the parking, and a great pizza joint in Cromwell.
Mount Washington (Tuckerman's) is great too, but Breakneck is a much shorter hike, just a few hours up to the old fire tower and back down. Mt. W is far more demanding of stamina.