Here is a tip for weekend warrior that might not have been posted yet:
1. Place a rock outcropping (before or during the weekend warrior goal), then whack it 19 times during unlimited energy time, then stash it somewhere in your kingdom (maybe behind a building) for the next weekend warrior.
2. When the weekend warrior goal pops the next time to "Mine a rock outcropping", you will only have to expend 1 energy to do so.
3. Repeat.