Tourism has been developing significantly in the last years, and the archipelago is certainly worth a visit. As a tourist, you should however realise that the arctic environment is extremely fragile, and has to be taken care of. As the Norwegians say, “You are welcome to Svalbard, as long as nobody can see that you have been there when you leave again”.
There are daily flights from Oslo to Longyearbyen, via Tromsų (and a couple of direct flights a week). Most specialised equipment for trips in the wilderness can be bought or rent in the capital. Unless you are very well acquainted with the arctic conditions, you should not leave the settlements without an experienced guide. In particular, polar bears represent a danger to be taken seriously.
A well prepared trip however is an unforgettable (and not especially dangerous) experience. Several travel agents and tour operators organise tailor-made tours, ranging from comfortable trips on a cruise ship to genuine expeditions with skis, sledges and tents.
There are two main seasons for a visit to Svalbard. Between end of March and end of April, the landscape is still covered with snow, although there is almost no more night. One can travel quite easily with snow scooters or with skis. Camping in winter is a particularly nice experience. Between end of June and end of August, the sea is usually free of ice on the West coast, and it becomes possible to travel by ship. During this period, the sun never sets, and lots of birds and sea mammals can be observed.