This site it only diveable a couple of times a year when the wind has died down for a few days. You can go straight out from the beach and kick straight out to the closes rock (Seal Rock). This is a fun dive. If you are more ambitious, there are several other rocks to swim out to explore.
From US-101 take the Trinidad Exit. Follow the main road towards the water, you will go through town and down a big hill to the beach parking lot. On the right, there will be a beach with lots of swell (State Beach) and on the left there is a restaurant, boat launch and calm beach great for diving and kayaking. You can even drive your truck out on the beach and park there.