Be sure to acquire a sun-lounger that is lightweight, robust & compact so's you can easily stow it in the deckchair storage locker/hangar thingy. (It's not on the official kit list.)
Subscribe to "Cockpit" magazine, they will have a list of reputable "clicky-bed" dealers & a comparison chart of the in-vogue sun creams. They also have bits about flight safety, but the cartoons generally sum up the important bits well enough.
Investigate whether you can acquire sunglasses through Naval Stores before you incur the uneccessary expense on a pair of Oakleys. :thumright: