You are probably thinking "Parking lot? Why did you give it 4 stars?" Because of the location! We stayed here for three nights in our 34 foot travel trailer. We barely fit into the back in site, and had to park our truck in visitor parking a short walk away. Other, smaller trailers had enough room for their vehicle to fit in alongside. The facility has full-hookups and they functioned fine. The harbor itself has trails but no other facilities for campers. No wifi but Verizon had good signal. The weather is perfect and we loved walking to the beach, to get coffee in Seabright, and driving into downtown and the boardwalk. It's fairly quiet at night, but you do have to watch your stuff. The first night we stayed here we got woken up at 5:30 in the morning by a rattling noise. Open the door and someone is walking away from our trailer. A look at our bike rack revealed that our ties had been cut. I guess the would-be thief didn't notice that the bikes were locked to the rack. Either way, you have to be careful, because this is Santa Cruz and there are a lot of weird folks about. So yes, there are some downsides. But we love Santa Cruz and it was great to be in such a central location.
The “harbor master” is rude and lazy. The spots are all paved. Water and electric included.