Im sorry I cant answere this question for you but there may be a LEO that can. I live in CA and have hunted out of state and of course brought my own guns accross state lines. Long guns and side arms. Never been questioned about it either. But......"Under the measure, any person with a state permit to carry a concealed weapon would be able to bring that weapon into parks and wildlife refuges unless a state law specifies otherwise." I interpret this as if you have a carry permit, you can now carry consealed in the park. If you dont, you cant. If and when its me in your shoes, my sidearm will be an open carry. I wouldnt want to have to wrestle with a coat or any other piece of clothing if a bear was comming at me. As far as CA is concerned, I would call the California State Department of Parks and Recreation to be sure.