1. Playing Monopoly.
The rules are quite explicit: If you land on a property you can buy it. If you decide not to, the property can be auctioned off to all the other players.
The bidding can start at any price. Playing by these rules shortens the game dramatically, and makes it significantly less enraging.
13. Taking your phone to the beach.
No need for expensive waterproof cases.
18. Cycling in a skirt.
Use an elastic band and a penny to keep your skirt in place.