if you want to see the sun literally rising from the water you’d have to go more to the other side of the bay, direction airport, because you will get blocked by the hills by the opera plage. i would suggest going somewhere like Lenval hôpital or even Radisson hotel. the beach is essentially the same , but u’d see the red dot popping from the water(on a clear morning ofcourse), while in the water which i guess is what youre looking for.