A gentleman/lady of leisure
Definition 1 of 1
Pro Tip 1/3Historical Context
Originally described wealthy individuals not needing to work, often in British aristocracy. 
In historical novels, characters are often portrayed as gentlemen of leisure.
Pro Tip 2/3Modern Nuance
Today, it may imply someone who is well-off but it's also used humorously for anyone relaxing. 
On vacation, I'm just a gentleman of leisure, no emails or calls.
Pro Tip 3/3Cultural Perception
Some may view a 'gentleman of leisure' negatively as lazy or unproductive. 
My neighbor calls himself a gentleman of leisure, but others see him as idle.