So, as I'm writing these tags, I realized Wu Xin is likely not as recovered as he seemed from how overexerted he was from the battle. Which explains why a few hours on water tired him out when in the show, a full day of such travel wouldn't have slowed him down.
So he's gonna spend more time meditating/working up his energy again and sleeping. Probably hiding out in places on the island mostly away from people for afternoon naps.