The party boat, you may have to set up and get several shots balanced to the different light colours/WB and merge them red, and greens burn out to white at different exposure times maybe a few shots 1 or 2 stops underexposed and Tewk post processing . Some lenses you can get a nice star effect with a f 16 or higher, worth a try maybe.
A sail boat is best shot from the water, from the windward side as the boat is healed over under full fail on a broad reach. See if you can get on board and get some shots showing the view that the person using the boat would see.
Looking forward, a nice over the stern sunset shot, party views from the point of the party person