overhead shot on beach/lighting in a tunnel

Hi, I'm a student filmmaker with a very limited budget. I am filming a music video and I want to do an overhead shot of a girl lying on the beach starting on an ECU of her eyes and the camera pulling up to reveal a wider shot of her on the beach. It's a good 5-10 min. walk to where the cars will be parked, so I'm wondering if there is a way to achieve this shot with minimal heavy equipment, or maybe something that can be put together on location. And also inexpensive.

Also, later in the video, there are a couple of shots in an abandoned fort tunnel. It is pretty short, I'd say less than a hundred feet in length, so natural light comes in pretty bright on both sides. When you're in the tunnel, it just looks like a blown-out backlight, so I'd need some artificial light to light the actors from the front. I know that HMI's aren't really portable, does anyone know of any way to achieve this kind of lighting without renting a generator?

Thanks! I'd appreciate any kind of help.