Citymaps

It comes with offline maps, routing and city guides for various locations from all over the world, but you will need to sign up in order to explore them. The app has a feature that lets you save places that you would like to visit with your friends. You can also set the app to only display restaurants, bars, shops, hotels and other places on the map.
 
Moreover, you can download as many maps as you want and the app lets you find friends on the network by connecting with your Facebook or Google account. You can also book tickets to various shows or get guided tours from within the app. It comes with tools for sharing your favorite places with friends.