Emma Wood is the State park campground and while close to the Rincon Parkway, they are separate. Emma Wood does not have water or a dump station available. You might want to ask the camp host if your camping permit would allow you to use the dump stations at the north bound state parks at Carpenteria, El Capitan, or Refugio.
For two nights, probably just enjoy the beach and maybe a trip into town for dining or tourist stuff. You could take a boat ride out to the Channel Islands National Park from the Ventura Harbor and do some whale watching also. Water temps have been unusually high and both Humpbacks and Blue whales have come within reach this year.
