Lowcountry Estuarium Share: Attractions Lowcountry Estuarium Visit Website 630 16th St. Extinson Port Royal, SC 29935 (843) 524-6600 Hours: Open by appointment only seven days a week. No admission fee but donations greatly appreciated. About Map About The Lowcountry Estuarium is a private nonprofit organization dedicated to the principal of Conservation through Education. It's also great fun for kids and adults alike. Creature Feeding is a trip!! Directions See video on website homepage.