Got 2 Orientals as trading-posts. I occupy 2 islands (as I use the non-default gold) by buying from Lord Richard "I'm the Privy Seal & Treasurer so my goods are expensive and random" Northbrough and set up 1 settlement as my capital, placing all my civilian stuff there, while the other is the powerhouse. Late game, I occupy other islands as trading posts or powerhouses.
Note on my terminology:
Powerhouse: Focuses entirely on resource gathering, no housing.
Trading Post: Basically a minor version of my capital, but focuses on trade.