Found out a couple of interesting things about the Emed antigen Test...

1) It usually doesn't trigger positive until >48 hours after exposure
2) i think there is a correlation between line brightness and viral load

So I got Covid Thursday 12/30 but didn't know it at the time. Got it from someone 2x vacced, boosted, and had Covid a year ago.

Friday i got the booster.

Saturday started feeling achy, tired and slight flu like systems which i attributed to the booster. As I had some kits from our last trip I took one. Negative.
Sunday afternoon i took one as others in our small group get together Thursday were reporting mild symptoms. Positive with a pretty solid line. No more symptoms after Sunday
Tuesday - very strong line (more than Sunday) and clearly positive
Thursday - fainter line
Friday - even fainter line
Saturday (today) (no line)

So clearly not a scientific study but if I were going to the islands again soon I would take one within 48 hours and then take another without a proctor just before boarding flight to make sure I didn't get trapped down in the islands and to keep spread down. You can get a non proctored version for personal use off Amazon for less than $9