You Can Climb Up Rain Gutters
You don't need Bouncy Boots to get to the roof of single-story buildings. If there is a vertical rain gutter on the building, usually near the side, you can climb it.
Always Have the Jump Pad Trap on Hand
This is an incredibly useful sign and doesn't cost many souls. Its the first trap you get. Use this trap to get to roofs of tall buildings quickly. Use it to jump over the city walls on the Mexico map.
Even if your opponent hears the trap go off, there is a good chance they won't realize you used it to jump onto a roof. The sound of traps going off are all the same.
You Can Destroy Traps and Rituals
I'm sure a lot of the old-timers know this, but I sure didn't. I only found out accidentally. You can hit the F key while your cursor if over an existing trap and your guy will spray white paint over it, destroying it. You can destroy your traps or other people's traps.
Useful when you get stuck in a Quicksand trap and your speed is reduced by 80%. Or when you've used traps to help defend a position, but then find you need to leave it cause the circle changed.
You can also destroy rituals. Happen to be close to that Zombie Apocalypse ritual some jerk just setup. Wipe it out.