I don't really ICS, but I do like large empires.
On archipelago maps, I found those sea tiles to be very lucrative.
With lighthouse, seaport, and fishing boats, just having access to 3 or more is a great site for a mid size city.
The harbour (railroad) connection is an awesome bonus, too.
So, I'd randomly drop cities on small islands or deserts, just to get at those sea tiles.
Then I figured since the landmass is small, it's actually more efficient for the coastal cities to mostly have sea tiles and specialists.
...
And the highest pop city possible amongst them working the land tiles, for dumping every single building possible on and cranking out the wonders.
ICS with arabia got me thinking, though.
If there's a luxury resource inbetween 2 cities, and they both have a bazaar, how does that work?