A group of backpackers hike the Rock Harbor Trail along Rock Harbor Channel. Things to Know. Advance group camping reservations and permits are required for groups of seven to ten individuals, including leaders. If your party exceeds ten, you must split into two or more groups (of ten or less), each independent and traveling on completely separate itineraries. For groups of ten or more breaking up into small-parties (1-6 people), a permit must still be obtained in advance.