We didn't end up parking here overnight but this was our second choice of a spot in Olympia that we sussed out. Free parking along the whole street with just a paved walking/biking path along the road. The bathroom in the park is open 7:00am-dusk. We ended up not parking here because there weren't really any other cars parked even during the day so we thought we might stick out at night. Worth a shot to park at though!