908 Madill St, SR 40 EKeystone, SD 57751 Phone: +1 605-857-8783Fax: +1 605-666-4343 Classification 2 Tourist Class Commission Rooms Rates 10% 37 $99-$99 (USD) Hoteliers! Is your information accurate? Update Here Royal Inn Keystone Location & Neighborhood Downtown.Hotel Location: Beach, Convention Center, Lake