Just remember, these places are nothing like you see in the movies or brochures--they are far more grand in scope and require wide lenses. Bring a normal as well for some intimate shots as well. If at all possible, visit Desert View Tower at sunset, and be on the roof with a monopod. I dont think they allow tripods up there, but the experience is breath taking and spiritual. Take your sweetie and make it a romantic moment as well. I proposed to my (now)wife there while shooting a sunset.