Well I'm no expert either, but may have just a tiny bit more experience than you do. First of all, try to avoid shooting in the direction of the sun, or having your subject facing the sun. Normally, try to have the sun to your rear-right or rear-left. If you HAVE to shoot into the sun, make sure that you camera isn't focusing on the sun or the sky, and instead is focusing on your subject. For my dSLR, I simply disable the focusing points in the sun/sky area and enable only one on the subject.
As for dark photos, that's probably because either, one, your shutter speed is to high, or two, your aperture is too small. Try decreasing your shutter speed and opening up your aperture a bit more. Also, it could be because that you're focusing on the bright areas too much, so the darker areas appear very dark.
Hope these will help. Good luck and enjoy your trip!
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