I thought I'd follow up what I did about my tripod. The day I posted this thread I was mailing a couple boxes down to the POP for our arrival a week later. One box was a small Christmas tree, so the box was the perfect shape to also put my tripod into.
At the last minute, I bailed and kept the tripod out, deciding to pass on castle pictures the first night so I could put it in my checked luggage. Turns out I'm glad I did. I mailed both boxes that Saturday by Priority Mail. The first one arrived Monday. The other box..... the one my tripod would have been in.... didn't show up until Friday. I had almost given it up for lost. Then when we checked in Saturday, they still didn't even have it at the resort. It took another day for it to surface.
Soooo........ In the future I might try to bring it in my carry-on.... but I definitely won't try mailing it.