A fast, cheap and comfortable way of getting to the different parts of the city, is by using the local bus traffic LLT. Local buses are usually 20 SEK per trip. If you plan on making more than 4 trips, buy a 3-day tourist pass from the tourist office, which allows you unlimited travel on local buses for 80 SEK.
At weekends you should be able to catch a night-bus from most local traffic bus stations about once every hour between 0.00 and 3.00, at a raised cost.
