It's not bad for a carry around lens, but 55mm is not a telephoto. It is roughly the power of the human eye. The 17mm is fairly wide, that should handle your wide angle. It might not be great for buildings, as they can be very big, but it should work for landscape and other things. Plus, you can always take multiple overlapping picture and merge them together to get one bigger picture.
If you want to take wildlife pictures (I guess it depends on your definition of wildlife) you'll need more power than that.