Two New Hampshire lists with a few good options:

52 With a View. A lot of these are way up, but there's a few within 90 minutes or so. https://newenglandwaterfalls.com/52withaview.php

Fire Towers. Wicked easy/older kid friendly (little ones might not be safe on the actual towers). I think it was the one in Derry you can skip, basically just someone's driveway and barely gets above current treeline. http://4000footers.com/list_towerquest.shtml