From a guide sent to members from the Royal Vancouver Yacht Club:
The Vancouver Parks Board is permitting visitors to Stanley Park only on foot or on bicycles, with some limited access for its stakeholders to maintain their facilities. RVYC members and tradesmen will have vehicle access, provided their vehicles display the appropriate parking decal and are entering the facilities for essential purposes only. …
If you do not have a decal, you may walk or cycle into the park to receive one.
Umm, essential purposes?