The tram runs approximately every 20 minutes going into Adelaide city starting from 5:46am and the last one returning to Glenelg at midnight. Pay on board with card or coins, but no dollar notes are accepted.
Once you are in Adelaide there is a free loop bus that you can get on and off as much as you like and it takes you past most of the city's attractions. This bus goes both ways around the city and there is a main stop in Victoria Square, where the tram stops.
There is a local community bus that goes around the Glenelg area that runs on Wednesday – Friday from 11:00am-4:00pm and you can get on and off as often as you like, but they do appreciate a gold coin donation to keep this service going.
All buses leave from Moseley Street in Glenelg and run quite frequently, there are a few other stops located round the Glenelg area and timetables will help you to find these.