Take a close look at the sign on the right. It may be on other boats as well. The same sign can be found at the Woodlawn Park Zoo, so it might be a common Washington State sign. At first glance it seems perfectly normal sign to indicate this is a bathroom, or in ship lingo, a head for men. You have the international symbol for Man, which indicates this is a mens bathroom.
Lets take another look at that sign.
Specifically, the baby changing table part. The way the person is standing and leaning over the baby indicates only one thing, this is a pediphile station. Any smart parent will be standing to the side where you can unfasten the diaper, roll the kid, place a new diaper down, wipe up any mess, snap them in place and hope to heck you can find a nice dumpster to dump the guacamole. All rights reserved unless otherwise noted. The Washington State Ferry System is in no way related to Wally Glenn and no endorsement is suggested or inferred.