Long Island Expressway to Exit 41 North or Northern State Parkway to Exit 35 North. Proceed north on Route 106 towards Oyster Bay. Turn left onto 25A Northern Boulevard. Make first right onto Mill River Road. Follow green & white signs to the Arboretum on Planting Fields Road. Planting Fields Arboretum State Historic Park 1395 Planting Fields Road Oyster Bay, NY 11771 By Train: Oyster Bay is the last stop on the Oyster Bay line of the Long Island Railroad. Planting Fields is approximately 1 ½ miles west. Print Friendly Page Click Here