Clue #10

"Here are suggested items to pack:
sunscreen, swimsuit, hat, sunglasses, beach towel, shorts, sandals, $100 cash."
-Mom

At this point I'm really confident that it's an island in Mexico. The trick will be figuring out which one. In any event, we're almost through the 12 clues and mom and dad said we get to know before Christmas, so it's not going to be a mystery too much longer.