FYI, you can wear makeup to beach if you want to. The only adjustment you probably have to make is simplifying your routine a little. Focus on what's really important for you, like your brows for example. Everything else, you can attempt to skip. Need an idea? Here's one from Kryz Uy:
Kryz's everyday summer makeup is all about well-hydrated and real skin, which means no wearing of foundation to cover it up. She skipped directly to grooming the brows and coloring her lips and cheeks with a pink tint. Even mascara was a no-go for this look! And there you have it—a photo-ready face done in two minutes!