It's free for HK residents with a HKID on their birthday. You still need to go to the counter to obtain a entry ticket.
I dropped someone off at Ocean Park last month, and they now have 'fast pass' that you can pay for, like at Disneyland. Don't know if you buy them at entrance or what, just saying they have them now
Good day.. i would like to ask if I'm free in ocean park on my birthday then i bring 1 friend, is she free also or what?