If you arrive this city by train with big luggage, I suggest you take a taxi to the hotel especially if you are staying next to the river.
If no luggage, it is a nice walk to the river or the certer of the city. Tourist information center in in the centre of the city, very easy to find.
Its a small northern city which has a few museums and a ski hill. The main attraction is Santa's Village which is mediocre.
The benefit is this city is small so depending on the weather you can walk to most places. Other places a bus can be taken and for the far out locations taking a taxi is affordable. Wouldn't recommend staying longer than 2 nights. We stayed here as a stop over from our time in lapland. Plus it also has an airport which is serviced by more airlines than other airports in northern finland.
Besides Santa Claus Village, nothing attracted to come here. Don't need to spend too much time to stay here.