Nikon D7000 for me, I have an assortment of lenses but the one that I usually take in the hills is an 18-105mm.
Depends on your priorities though - a dSLR like mine is a fairly chunky/heavy option (around 1kg all up with that lens on), if you're not keen enough into photography to care about the extra manual control and better image quality then a compact zoom like 223nut suggested might suit your use better and still be close enough for image qual.
Basically everything is a compromise, the trick is just figuring out your preferred combination of size/weight/zoom range/image quality/cost etc.
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