This is probably one of the strangest places for IFR

One minute... Ceilings 2000 light rain, visibility 3 miles
Next minute... Ceiling 200 heavy rain, visibility 0 (might as well be)

But on a serious note; When Hawaiian Airlines (Inter-Island Airways in
1929) started flying when they encountered IMC the pilots would descend
to about 80 feet and fly IFR (I Follow Reefs), where they would use the
white surf generated by a reef to circumvent an island, when it would
clear up enough to fly IFR they were back at it.

This tactic got used with DC-3s during WWII also, as the government
decided to shut down all navigational aids and beacons... bummer.