Setting up the tripod is a crucial part in getting your long exposures. for start, you will need to sink the tripod legs into the sand to ensure a sable tripod. secondly you can level your tripod the the desired height for your composition. Be careful when attaching your camera, you wont be happy if you accidentally drop your gear.
The two left images above are of long exposure sunsets. The right image is a daytime long exposure taken in the rain. It can be handy to carry extra cloths or wet weather bag covers to use to protect your camera.