I saw a post the other day where someone said it was "gross" that people were laying out on the grass. Idk how someone could think it's gross - maybe they've never lived in or visited a city where it's pretty common (like NYC, Boston, and I'm sure many, many others). I'll happily let my kids take a break there.
Wherever we are in public, we generally try to find an out-of-the-way spot to let our kids rest. Luckily, both have always been perfectly capable of sleeping in their strollers (and DD no longer naps), and neither require quiet to sleep. I'd personally find having to go back to the resort to rest to be a huge bother, but I'm sure some people enjoy the break.