Waypoint mission are repeatable and pretty accurate. The only pitfall in your plan is if you intend to get close to an object be mindful that you need to launch the drone from the same location. The elevation of the drone is bases on the launch...
I’d be flying the done out far enough to get the vertical (if the drone can alter its camera to portrait orientation do that) framing I want and then fly the drone sideways in a straight line along the beachfront taking overlapping shots. Don’t...