For sweeping beach scenes a wide angle lens is perfect but if you're featuring people in the frame go for a smaller portrait lens. As the lights low you may find a tripod useful; light tripods are portable but strong coastal winds can wobble them and ruin your shot so opt for one with better ballast. Amber colour correction or warm up filters will remove blue haze from shadows and add more warmth to your images and if you're using flash, try placing an orange gel over it to warm the harsh light.
Coast direction will alter when warm light appears so make a note of the direction you're facing otherwise you'll find yourself sat twiddling your thumbs waiting for the right light to appear. You'll find that sunsets appear to be warmer than sunrises and this is because of the pollution that's built up through the day and scattered through the air. Some subjects such as sand are warmer so will work well in warm light. If you think your images need slightly more warmth try adjusting the white balance or if you're shooting in RAW, you can make the changes in post production when you're back from the coast.