Soaring Eagle Inn and Conference Center will close at the end of the month to make room for something bigger, better and wetter. A 45,000-square-foot indoor water park, organized by the Saginaw Chippewa Indian Tribe, is slated to open in spring 2011. “There’s been a renovation of some sort planned for sometime,” said Mary Kilmer, marketing and public relations manager for Migizi Economic Development Corporation, an affiliate of the tribe.