I'd bring 2 lenses or something, especially if you're hiking or going far. I love bringing my 50 1.8 around since it weighs nil, and compacts small, and then I bring a really light and compact 28-80mm USM for everything else rather than my beefy 18-200mm IS, which weighs a ton (and is kinda stupid to own in the first place) Bringing light, cheapish but still decent glass is pretty safe. Whenever I backpack I utilize this combo. It fits better this way in my backpack too.
Have a nice day, Bluename.