See the very recent report about parking at Seymour and Cypress parks in the FMCBC Newsletter.
Note the last sentence soliciting input on your experience at either park's parking issues.
Yes I read that last week that has more to do with where you can park when there is snow. Anyways my current plan is to head through the gate at 8:10 on Tuesday night and go for a hike up to brockton. I suspect the attendant will write down my info and let me through without the police this time. Not that the policy has changed but rather it is easier to ignore me than to make a stink but who knows.