4/5 - Good
Tickets can be bought on the day from one of three booths but I would recommend getting there early to avoid queues. You can rent either a locker or a private cabin to change in but the lockers should be fine for most. Accessing the outside bathing areas is a little tricky and not well-signed; you need to go all the way to the end of either "corridor" and go past the showers. Check the maps that occasionally show up on the walls.