Here's some ideas:
Mechanical:
You could go shopping? Get some custom items made, sell some stuff and so on.
Make contact with the people who can get you into the next prestige class. (although this is at least half storyline...)
Storyline stuff:
Try and make yourself useful to the local rulers. You might get a title, castle and/or even years worth of problems to solve?
Gather a unit/army/legion of followers.
Found an orphanage.
Find and train an exotic mount.
Really pointless:
Get drunk and chase members of the opposite sex around.
Buy chickens. They only cost 2 cp each.... you could probably afford hundreds of thousands of them?
Hire mercenaries to distract your wizard. Just so they can't get any research done.