Getting to San an bus station you might find trying to flag a taxi down hard work as they don't seem to want the short fair from the bay to San an centre.
Either get one booked from hotel desk, or there is a semi regular bus you can get there. On foot it's about 30mins.
Taxi fairs from bay to ushuaia is gonna be around €35-40 each way roughly. There is the disco bus for €3.50 from San an bus station to outside ushuaia/hi (was space) and runs from 5pm (or did last year) until 5am ish in the morning. There's also disco bus for Pacha and amnesia, make sure get on right one, there are disco bus marshals that will help out at station.
It's fun going with everyone in party mood, although I'd suggest taxi on way back as ~45 min journey feels like forever with the walking dead
on return lol.
If walking back from station keep aware of your surroundings, I've never had problems walking back to bay solo at 3-7am in morning, but there are people who look out for wasted people on their phones to rob. Just common sense really. - or taxi from station to bay will be about €7. + plus a taxi driver moaning about the short fair