Smartphone app ideas

For my group we have came up with a couple ideas as of now. as far as i understand the app needs to have something to do with location finding. so we went off of that idea and tried to think of some places that people would like to have easily located on their phone or ipad. a couple of the ideas we have come up with are a food truck vendor locator to help locate good food in major cities, a trail finding app so you can find all of the good spots in the northwest, or even a fine restaurant locator with reviews so people can get exactly what they want to eat whenever they need.