Good one. There never was a pure travel/adventuring one last year. Throw out some more possible scoring components for me. Adventures completed seems like a good one.
Number of Unique Adventures Completed
(All of the following stats can be pulled from the Adventure Journal)
Common Relics
*Simoleans Earned Selling Relics
Relic Collections:
*Number of Relics Found (by location)
*Number of Collections Completed (there are 9 total)
*Simoleans Earned Selling Relics
Tomb Stats:
*Ancient Coins Collected
*Number of Tomb rooms explored
*Number of Tombs completely explored (by location)
Number of Challenges Completed:
*Historical Hoarder (Common Relics)
*Relic Collection Connoisseur (Relic Collections)
*Rubble Excavator (Tomb Stats)
*Well Spelunker (Tomb Stats0
*Hazmat Sim (Tomb Stats)
Maybe Simoleans earned Selling Relics (Common Relics + Relic Collections) + Ancient Coins Collected as the main score.
Multiplier be calculated off unique adventures + challenges completed (.2 per challenge, 5 total) + number of rooms explored + collections completed (.1 per collection, 9 total).
Simoleons Earned Selling Relics:
** Common Relics - $$$
** Relics Collections - $$$
** Ancient Coins Collected - $$$
Mult - Base of 1.0
** Collections Completed - .1 per collection (max of .9)
** Challenges Completed - .2 per challenge (max of 1.0)
** Rooms Explored - .1 per room
** Unique Adventures Completed - .1 per adventureOr something like that

Timing is still throwing me though since the challenge is based on vacation time, I was thinking a 12 week challenge but the time would need to be based on vacations days taken. The journal also keep count of number of days spent in each location so 20 or 25 days in each location would about equal to 12 game weeks (12*7=84 vs 60 or 75 vacations plus down time waiting on the moodlet to expire), or just a total of X number of days on vacation, split at the player's discretion.