I think a good nights sleep is always a good idea so the luxury item being a bed is a great idea. I also think the wand would come in useful as well. It would ease the lonely days and nights. (Assuming you were on the island alone) @misskack26
If i was hoping to leave the island id have an inflatable sex doll to use as a raft, a sqweel toy to use as a sort of motor, some flavoured edible lube(would keep me fed for days lol)
The final scene of Castaway where Tom.Hanks gets rescued would have been so much better if he had been found floating on a blow up sex doll using a vibrator as a motor.
People would think heβd been shipwrecked in Magalluf !
My Fleshlight for personal fun, if the island had natives living there and they were into bondage then a rope for tying them up to enjoy restraint play.
Luxury item my own private cinema to go relax and watch my favourite programme on occasions.