The link at the bottom of this page will give you a map of Watsonville. But Harkins Slough Road might cause some confusion, so these instructions will be helpful:

Harkins Slough Road is a paved road that travels through the sloughs. At some intersections, it is only open in the summer. The intersection at Green Valley Road, and the intersection at Walker Road/Ford St. are not reliable approaches to the Nature Center.

Here are your best approaches:

Coming south on Highway One:

1. Take the Main Street/Highway 152 exit. Continue on Main Street, then right on Ohlone Parkway. Travel past the Overlook  Shopping Center, then left on Harkins Slough Road. Just past the tennis courts, turn left into parking lot.

or

2. Continue on Main Street to Ramsay Park. Travel all the way to the back of the park, past the skateboard park, left at the soccer dome.

Coming north on Highway One:

Take the Green Valley Road exit to Main Street. Right on Main Street, then continue as described above, traveling on Ohlone Parkway or through Ramsay Park.