Visit the Accommodations page to see more! Zion Retreat Center is the first of it’s kind on Galveston Island. Formerly a church, the retreat center was given over to Lutherhill Ministries Outdoor Camp and Retreat Center, of La Grange, Texas. Lutherhill has been in the camping and retreat business for more than 60 years. Zion Retreat Center is a second, alternate location where guests can enjoy the island vibes.