I also took the LYNZ bus service from TTC to Seaworld. I called and they said it runs every 30 minutes from TTC on the half hour mark...9:00 am, 9:30 am etc. We got there about 8:45 and the bus pulled up about two minutes later and we left within 5 minutes, so it was departing before 9 am by about 8 minutes.
We did tell the driver we wanted to go to Seaworld and he motioned to us when it was our stop and pointed to where we would need to get back on the bus.
When they drop you off there is no sidewalk, just the grassy area and a small ditch that we did not cross due to the water in it. We walked to the entarance of the parking lot and cut across to get into the park.
I would also use this method of transportation again. A total of $10.00 for four of us.
I hope this helps.
Lori