I would add a dedicated game room/wing to my house. It would have built in shelves all around the room and glass cases for display.
Then I would fill my dream with every game and system I could find. I would start with finishing the NES library including Gold and Gray NWC carts and Stadium events. I would buy stuff like a fool/asshole.
Finally, I would video it and put it on the internet. I always wanted to be internet famous.