I will do one of two things for explaining everything: 1) Make an in-depth guide 2) Make an in-depth video
OK since I have longer to do this and fix it up... GIVE ME SOME COOL NEW IDEAS TO PUT IN PEOPLE!!! No mods however.
1. Potion/potion materials spread through the map. 2. Enchanted books that can be used to upgrade weapons people own. 3. Spawn eggs for hostile mobs hidden throughout the map.
1) Possibly 2) No 3) Mobs have to be disabled for the map, because if a creeper accidentally explodes near a bomb site...