The Casio G'zOne Commando is one rugged tech gadget that goes where no iPhone can. This Android-powered smartphone retails for $199 from Verizon with a two year contract, and it meets military specs for toughness.
It can withstand short drops up to 5 ft, full immersion in water, sun exposure, mud, and more. However, it will not meant to be used as a diving or swimming phone and won't stand up to extreme impacts or pressure. The apps which are included with this phone are similarly suited to outdoor adventure. For example, one shows a compass that realistically rotates as you move, and another is a temperature indicator. There's also an app for checking on ocean tides anywhere in the world, and another which counts how many steps you take on a hike.