honestly anywhere in the city is ill.
the mission is good for pushing around / close to potrero park / downtown / 3rd and army. there are a lot of murals if you are looking for the arts.
lower haight is pretty centralized / you are near dlx skate shop and ftc.
the tenderloin has some good music studios but is pretty grimey in spots.
the whole city is a skate district for the most part.
i live out in the outer sunset. it's chill, outside of the city, amazing hills to bomb, good vibes, gots the ocean to go surfing if ya dig, lots of nature for inspiration.
just across the bay is oakland which has a pretty sick skate / music / art / diy scene.