Coastal cities cannot be underestimated in value. My minimum threshold is:
2 sea resource tiles (not including atolls)
1 land resource (ideally strategic)
3 other workable land tiles
1 unique luxury
or
2 repeat luxuries
or
2 strategics
Harbors are awesome if you have at least 2 sea resources.
2 sea resource tiles (not including atolls)
1 land resource (ideally strategic)
3 other workable land tiles
1 unique luxury
or
2 repeat luxuries
or
2 strategics
Harbors are awesome if you have at least 2 sea resources.