My default answer is "do them all."
#1 and #3 can easily fit into a "mini-adventure" as part of #2. I completely agree with the scavenger hunt, possibly verifiable by claiming a cultural item from each of seven continents.
One item, in the frozen north, traps the characters in the bodies of toys. And it's Christmas Eve! Hilarity ensues as the PC's try to convince the Elves and Father Christmas that they don't belong in the sack with the rest of the toys. Nutcracker Prince, anyone?
Another item, in the Bermuda Triangle, forces the PCs to go underwater to verify, once and for all, that there IS an Atlantis.
