From the Ferry
, go north on 305, left on High School Road, right onto Fletcher Bay/Miller Road, left onto Tolo Road, right on Battle Point Drive, and right into the park.
From Agate Pass Bridge, go south on 305, right on Day Road, left on Miller Road, right onto Tolo Road, right on Battle Point Drive and right into the park.
If you approach the park from Arrow Point Drive, skip the eastern entrance, which will not take you to the Observatory
, and drive around the park, continuing on Arrow Point as it bends right past the eastern entrance, left around the north end of the park, and left again heading south. Turn left into to the western park entrance, and follow the drive to the Observatory.