If you're on vacation you may end up on a bus or boat tour. And everyone will rush to the front of the boat, because, hey, that's where you get the best pictures! And there's some truth to that... but let's assume that you're not first in line. Don't just fill up from the front back, grab the very back seat! This way you'll be able to get photos without anyone in them of whatever you're seeing when you go past the interesting thing! (This is probably better on boats then buses).