Here is my list:
1- 100,000 square foot house including a six bay garage, a shop, foundry, several other outer buildings on 10,000 acres of pastoral splendiferousness.
2- Add 30-50 bikes to my collection.
3- Complete my collection of US Postage stamps; the plate blocks and grill issues specifically.
4- Put in some rail road tracks and add an engine, a few boxcars for storing garden tools, and a caboose for my other office.
5- Upgrade my girlfriend.
6- More pocket watches.
7- A big collection of arcade machines, amusement devices, slot machines, and penny drops.
8- A fifty dollar savings bond.
7- A few cases of fifty year old single malt.
8- A walk-in humidor.
9- Replace my illegal immigrant workers with legal ones.
10- Custom built-in bookcases with glass doors for 3500 books. A map room, rare book storage, storage for philatelic items and a panic room. Attached would be a 200 seat home theater and a Malt Shop, like in the days of old and soda jerks were in abundence.
Or build one of these and make it bigger:
Virtual Tour Steampunk House Sharon MA Photographed by Jay Groccia, Principal Photographer, OnSite Studios