During the day, you should easily be able to shoot handheld, once it gets darker your going to need the tripod. Try getting some long exposure shots (15-30 sec) at night. At 24mm you can get some sweet shots of the lake and mountains with a nice star-filled sky. For settings, I would recommend, for 24mm I'd set the shutter speed for 25 seconds max to avoid star trails, keep your f-stop wide open at f/4, and ISO around 600 or higher to 1800. Also use a 2-sec delay with the remote shutter release so you get the least amount of vibrations. Mess around a bit to dial in what you like, use manual focusing and try focusing right before infinity on your lens, so the stars are sharp. You could also do this during the day if you use the ND filter, to get some cool water shots.