take the public bus "link 50" from TTC... takes 20 minutes. doesnt make any stops along the highway untill you get to seaworld. drops you off right at the gate and it's a quick walk... $1.50 each... can't beat that.
just google "golynx" to get the public transit website (since apparently i havent made enough posts to post a website address)
i've only used the $14 mears shuttle to get to universal because that takes too long using public transit. in my opinion, the "link 50" bus is suuuuuuuper easy and simple and it's no way worth it to pay $14 each to get to seaworld and back!!