Duke Island Park, Old York Rd.
Great paths for stroller walks, open air summer concerts, great sandbox area, full sun great for cooler days
http://www.somersetcountyparks.org/ (click on Parks)

North Branch Park, Milltown Rd.
Traditional wooden playset, Full sun great for cooler days
http://www.somersetcountyparks.org/ (click on Parks)

Branchburg:

http://www.branchburg.nj.us/index.php?option=content&task=view&id=199

White Oak Park, Baird Rd.
Shade is great for hot days, covered pavilion, tennis courts, playing fields

Neighborhood parks:
- Brandywine Park, corner of Lukes Pond Rd. and France Dr.
- Marshall Street Park, Marshall St. in Neshanic Station Village
- Olde Towne Park, corner of DeAngelo and Narragansett Rds.
- TenEyck Park, Route 28 in North Branch village

Whiton School, Whiton Rd. (when school is not in session)
Nice new playsets, usually empty