Take I-5 South to Exit 230. Follow signs to Coupeville on Whidbey Island. Make a left at the traffic signal (overpass) into Coupeville drive .7 mile from the highway on Main Street which turns into Coveland Street at the tight bend at the bottom of the hill  and look for the Garden Isle sign on the left. 

From Pt. Townsend/Keystone Ferry:

Make a left off the ferry  stay on that same road 4.7 miles which changes names from Engle Rd to Main St. to Coveland St., drive . Look for the Garden Isle sign on the left. 

From Seattle:

Take I-5 North to Exit 182. Travel Hwy 525 to the Mukilteo Ferry* (20 min. ferry ride). Follow 525/20 to Coupeville (approx. 40 min.). Make a right turn at the signal light (overpass);into Coupeville drive .7 mile from the highway on Main Street which turns into Coveland Street at the tight bend at the bottom of the hill  and look for the Garden Isle sign on the left. 

Visit

Washington State Ferries Online to plan your travel times.

*An alternative, to the sometimes long wait at the ferry, is driving around via the Deception Pass Bridge.