When we did this, we parked in the Hotel, hitchhiked up to the viewpoint, (stand at the bus stop and take whichever comes along first). We walked to San Seb and took the ferry home. Walk to the Laurel Bar and take the elevator up to the hotel to return to your car. The last few Km into San Seb is a bit boring. We walked it but I’d advise hitchhiking. If its open, consider Dinner at La Forastera before the last ferry or bus home. You should reserve though +34 636 77 12 18.