What is deployment to Guantanamo Bay, Cuba like?

You’ll eat lunch 200 yards from the enemy.

Don’t call it a deployment, it’s just a hardship assignment. If you like the water and beaches you’ll enjoy it there. If you are active duty you will most likely go to the MP unit there. Like someone else said it’s garrison life with a twist. It’s something many people don’t get to do or go do. Worth going for a year.

Came back last November.
Expect garrison lifestyle. Inspections, work schedules, short-notice all-hands accountability formations. Stay on your P's & Q's and you'll be fine. Have some time at the beach, enjoy the gyms on base, and use that time to bond with your unit. Maybe catch a drink or two at O'Kellys, or get brunch on a Sunday with an oceanside view. Go bowling, get scuba certified.
Don't dick with the iguanas unless you want to end up bankrupt.
Do the right thing, work diligently when it's time, and spend your off-hours productively (or just recharge).
Overall? It's cake, but remember that you'll get out what you put in.
You'll either get fit or you'll get fat.