If you read/understand French and are interested in hiking in Réunion you might like a new smartphone app: Decat'Rando.
Created by a well-known brand of sportswear shops the free app has more than a hundred hikes ranging from very easy to very difficult, less than two hours to more than eight hours, and tells you the weather forecast, the duration, distance, elevation, difficulty, trail description and even shows you a preview image.
|Piton de la Fournaise, Réunion (Wikipedia)|
You can also share locations and performances on social networks directly from the app, and view your location in real time, which reduces your risk of getting lost!
Currently only available for iPhones, an Android version is planned for 2013.
P.S. Note that while iTunes' Appstore shows the app as being made available in French AND English, this is an error - it's currently only in French.