I worked at Johnson's of St. Mary this past season. It is a full hook up RV park and you will not get a better view of Glacier National Park. Johnson'a is on the hill north of St. Mary and at the east gate of Glacier. Stay 7-10 days. Going To The Sun Road will not open to early July. Do as many short hikes as you can. Good information is available at the St. Mary Visitor Center. Also visit: Many Glacier Lodge, the Lodge at East Glacier (both are 100 years old) and do the Going To The Sun Road as much as possible. After this summer, I know why so many people return so much. You will not be disappointed!!!!!