Bauer Environmental Park, Colonie, NY – less than 1 mile loop, all boardwalk.
The Crossings of Colonie – Lots of playground areas and paths. Has a nice path around a lake, and great for kids to see turtles, fish, and birds.
Five Rivers Environmental Education Center, Delmar, NY – Awesome place for kids of all ages! Several hikes to choose from, from 1/4 mile ADA compliant trails to 2 mile trails. They really have the easiest, shortest trails! This is also a great option because you can go when the nature center is open, and use the facilities as well.
Saratoga Spa State Park, Saratoga, NY (Capital Region) – Great place for kids to explore, from the trails to the springs, play areas, picnic areas and more.
Tawasentha Park, Guilderland, NY – Lots of wide open spaces, paved areas, and some easy trails to explore. Plus, you can check out the Normanskill River, playgrounds, and a pool. *Note: you have to pay to enter the park if you are not a resident.