BAD IDEA
Can you get a tan from moonlight?
Nope. Moonlight is just reflected sunlight with no tanning powers. Your beach glow won't come from the moon.
Moonlight is simply sunlight reflected off the moon's surface, but it lacks the ultraviolet (UV) radiation needed to tan your skin. UV rays, primarily UVB and UVA, cause your skin to produce melanin, darkening your skin as a protective response. Since moonlight's UV levels are negligible, you won't get a tan lounging under it. So, unless you enjoy sitting in the dark pretending to get a golden glow, moonlight is a tanning bust.