Cass Park -Cass Park is on the West side of Cayuga Lake. The sprawling park boasts great paved waterfront trails, playgrounds, the Ithaca Children's Garden (see below), plus a - Roller Skating in the summer, Ice Skating in the winter.
Cornell Plantations - From taking a stroll through the Arboretum, playing on the large statues and feeding the fish or touring through the beautiful botanical gardens, or take in one of their special events.
Ellis Hollow Community Center - This community center just out of town on the East side has a nice older large wooden play structure.
Sciencenter -On top of their amazing indoor activities, the Sciencenter also has a fabulous outdoor play area with a climbing structure, duck and water play, bubbles, bridge, sand and more. They also have a Mini Golf course.
Mini-golf pricing does not include nor require museum admission.
Myers Park - This park in Lansing has a great playground and Swimming
Primitive Pursuits - Primitive Pursuits has outdoor recreation programs for kids of various ages, including their new Forest Preschool and free outdoor preschool playgroup.
Stewart Park - Located on the Western side of the lake near the Ithaca Youth Bureau, Stewart park has a play area for little kids, one for bigger kids, walking paths, a merry-go-round carousel, and sprinkler fountain area for water play. Stewart Park also has lots of green space for ball games & running, pavilions and a pond where people can fish. The one drawback of this park is that sometimes it is heavy with goose droppings. It can also be a little chilly as it is on the late.
Trails - There are tons of fantastic trails for walking, hiking, running & biking in Tompkins County. East Hill Recreation way and South Hill Recreation way are both very stroller friendly. The Game Farm Road section of East Hill Recreation way is especially flat to hike and bike. Six Mile Creek trails (wildflower preserve) can be stroller friendly, but most are at least baby carrier and small child hikeable. The "Trails" link is to a pretty comprehensive list of trails on Wikipedia.
Treman - The nice new playground at this park is located close to the entrance and pretty far from the picnic and swimming areas at the lower entrance to the park South of town off 13. Although it has really fun play structures and lots of swings, it does not have a lot of shade. At the upper falls, there is an old mill that has some historical information inside. The walk to the upper falls (Lucifer Falls) is my personal favorite in the area. The walk is not stroller friendly, as it has many steps, but is short enough and has enough breaks between steps to make it easy enough for those with mild mobility issues.
The "Little Houses"/"Tiny Town" as it's referred to by locals, is a group of three wooden play houses: mini-library, mini-fire station (complete with fire pole to slide down) and mini-house) located right on Main St. in T'burg (right in front of Colonial Laundromat, across the street from Gimmee! Coffee) It's a hot spot for kids and visitors often say, "I'd be here every day if I lived around here!" It's also a great place to have a picnic with it's slate table overlooking the creek.
Varna Community Center, 943 Dryden Rd. (Rte. 366) Ithaca. Large, professionally designed & recently built playground with
activities for toddlers and older children - swings, slides, climbing
wall, overhead rings, lots more.