Customisation of app for android & ios

We need a customised app for android and ios use for an upcoming trip. We want to share information on where we are going, photos of our journey, Due to time constraints we think it needs to use an existing platform that is already published on the apple and google play stores and has reasonable maturity. So if you know what you are doing this could be a quick little customisation job. It needs to have: - calendar with detailed itinerary - information on sights we are visiting - maps of travel journeys (could be powered by google) - emergency/group contacts - photo share (potentially linking to eversnap or something like that) - link to twitter stream Needs: - to be available for use by 12 March 2015 - ensure any information on it does not become the information or subject to use by the platform owner. Nice to have's: - alerts that go off when you are due back on the bus - word of the day - daily quiz questions