Deer Lake Outdoor Center boasts 250+ acres of hiking, camping, and water activities, with a glacial lake and larger Deer Lake. In addition to excellent presentations and summer camp, it is open to the public (when not conflicting with existing programs). Trails range in length and difficulty.
Descriptions, maps, and directions: https://deerlakeoutdoors.org/ , https://deerlakeoutdoors.org/wp-content/uploads/2024/07/Deer-Lake-Outdoor-Center-Map.pdf
REMEMBER: Follow basic hiking guidelines: Wear good shoes, bring water and simple first aid kit, plus a copy/phone photo of trail map. Check the weather ahead of time, if you go alone, let others know where/when you’re going. All participation is at your own risk. Find a nearby restaurant or ice cream shop to reward yourself after your hike!
HIKING HINTS is a program of the MIDDLETOWN CT REC office. Follow them on Facebook.
Beth Lapin 
That looks like a place the grandchildren would enjoy
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Check it out and see!