Delaware and Raritan (D&R) Canal State Park will hold an Arbor Day open house April 29 from 1-5 p.m. at its new headquarters at Mapleton Preserve, 145 Mapleton Road, Kingston section of South Brunswick. The event will feature a 30-mile early morning bike road with East Coast Greenway at 9 a.m. beginning at Flemer Preserve, Route 27 and Main Street. It will also feature programs about the former Mapleton nursery, bluegrass music by Mountain View and Riverside, tours of the preserve. Sen. Rush Holt will speak at the dedication ceremony at 2:30 p.m., as well as Commissioner Lisa Jackson of the Department of Environmental Protection, and Mayor Frank Gambatese of South Brunswick. For details, call (609) 924-5705 or go to www.dandrcanal.com/programs.html.