The MotorCo Guide to Six Flags Discovery Kingdom application is a relative location and semi-virtual based guide to the amusement park in Vallejo, CA (outside of San Francisco). The free version of the app has ads, but no registration or sharing of location. The app calculates the users distance to all of the attractions in the park, and sorts them from closest to furthest so the user knows exactly what is around and which rides are nearby. This allows the user to triangulate their distance and make better decisions and optimize your time. Each attraction also has a detailed description, a live Google map that will take the user to the location, as well as a YouTube video or VR simulation that shows the user exactly what the ride is like, so you can simulate what the ride is like before you go on it. For the rides, we find videos can be more informative. I. e. we could show you the landing of the Joker, but its not the same as watching the ride from start to finish. This way you know what you are getting yourself into. The restaurants are in the app as well and the app works on the wearable. Let us know what you think and if we missed anything. About Six Flags Discovery Kingdom: Six Flags Discovery Kingdom (formerly known as Six Flags Marine World, Marine World, The New Marine World Theme Park, and Marine World Africa USA) is a 135-acre (55 ha) animal theme park located in Vallejo, California, roughly halfway between San Francisco and Sacramento on Interstate 80. The park includes a variety of roller coasters and other amusement rides, Discovery Kingdom has been part of the Six Flags chain of amusement parks since 1999.