

The problem comes is the suggestion of travelling to destination X (in your case, the Bahamas) doesn’t just pop up out of thin air - friends may have travelled there recently, perhaps there has been a recent advertising push, etc.
Another family member looking up some destinations to travel, then speaking with you later - same external IP of the home wifi being reported, bam you get advertised the destinations they looked at the most.
Choosing a “random” topic again also doesn’t come out of thin air.
Other folks in the area searched it, and bluetooth nearby as well as wifi tracking put them all in the same place. Same as old mate with the Spanish comment, he was hanging around in an area with folks who regularly look at stuff in Spanish.
What you think might be spontaneous isn’t.