I have just added a few more events to the 4 hourly schedule. An animated crash that is either a plane or a heli, and when it crashes it spawns weapons and ammo, a building one that spawns a crate of goodies in an area defined by an opaque coloured circle, and a few more.
Lots of stuff to do if building is starting to annoy you. Take a break and do some missions! Watch out for bandits though