Jack Bay State Marine Park is located 15 miles from Valdez, southeast of Valdez Narrows. The uplands of the park consist of alder, muskeg, salt marsh and old growth forest of spruce and hemlock. The northern arm of Jack Bay within the marine park becomes shallow one-quarter mile out and caution is recommended. Although the bay can be used as a fair weather anchorage, it is not protected. 

The best campsite is located on the island in the middle of the bay. On the southeast end of the island is a protected bight, or bend in the coast, with four campsites. Two of the campsites are tent platforms. There is a small "low-boy" latrine located near the campsites. Two other tent platforms exist near the tip of the peninsula on the mainland just east of the island. A fire ring and cooking area is between the two sites. None of these campsites have water nearby. Water can be obtained on the northern shore of the bay.