I am mailing our toiletries down in a Priority Mail box ahead of time tomorrow so we can do all carryons. I refuse to pay the $15 for a checked bag on American Airlines! So, I was thinking about it and wanted to know how to send it back home. I can bring my pre-paid postage and label with me and slap that back on the box, but where can I take it to send it out? Will the resort put it back in the mail for me? I know you can mail postcards out. Will they also take this? It is in a flat rate shrt box from the post office. TIA!