You can absolutely read a book on the beach—but not a nook. A nook is by definition a sheltered corner or secluded recess, while a beach is an open shoreline. The confusion likely stems from the Barnes & Noble Nook e-reader, which you can take to the beach (though sand, salt, and glare pose challenges).
Use waterproof pouches, keep devices in shaded bags when not reading, rinse sand off hands before handling, and avoid reading during peak UV hours when glare is worst.