albaby2: Why not issue a card type pass rather than a "sticker"? This would eliminate people with two cars, but who drive only one at a time for recreational purposes, from having to purchase two "stickers". ... This would save families extra expense ...
I am inclined to like this alternative. The windshield decal has bugged me for decades, as an inconvenience and unnecessary expense if I want flexibility.
I'd gladly pay the full shot -- say $25 or so -- for the card type pass, for the convenience. This actually would cost me more per year than shelling out the optional $10 per vehicle registration, but I really don't mind that because it provides me greater flexibility. Besides, I think our state parks are wonderful places worthy of public (taxpayer) support. (Of course, I also may have overlooked a point or two regarding overall revenue while focusing on my own convenience here.)