I had to go with lighthouse. There weren't many attacks on the board, but I knew my opponent would grab them up if I started getting too far ahead. I don't have all the sets yet, so most of those options are out for now.
Embargo would have been an interesting move.
In trying to recall the kingdom, I know we had Venture and Contraband, plus Merchant Ship, King's Court, Woodcutter, Minion, and Fishing Village. Plus Mint and Great Hall, of course. My first few turns were spent buying cards that would boost my economy back to where it started, accelerated by the Mint.
The funny thing is, I thought I was farther ahead than that when I ended the game. Had I known it was that close, I would likely have played for time, and then lost.