There are several bivouac sites within the park and more outside its boundaries. The three most strategically located are in Osowiec-Twierdza (2km from the information centre), Grzędy (a gateway to the Red Marsh) and Barwik. All three are accessible by road and have car parks. You'll pay about 6zł per person per night to pitch your tent. There are also five rooms (for up to 16 people) in the hunting lodge (per person 35zł) in Grzędy.