how can go to ocean park?

首先乘地鐵從青衣乘東涌線直去香港站 (成人車費 $12.50, 學生 $5.90), 在 A 出口 (交易廣場) 返回地面.

步行到交易廣場的巴士總站, 在這兒乘 70 / 75 / 90 / 97 / 590 等等巴士線, 在 "香港仔隧道收費廣場" 下車, 沿指示步行 5 分鐘便到海洋公園了... 巴士車費只是 $4.70 (590 需要 $6.50) 比海洋公園 629 專線便宜多了.

而以上巴士線, 以 70 號的車程最快, 如不塞車, 10 分鐘可到下車點了, 其他路線, 也只是 20 分鐘車程. 如是星期日及假日, 90 號更直達海洋公園門口 !!!

I suggest you take the MTR form Tsing Yi Station,and take the Tung Chung Line until arrive the Hong Kong station, walk about 5 min inside the station (no need to exit) to the Central station and take the Island line and get off the train at the Admiralty Station. Leave by exit B, then you will see the Chinalink Ocean Park Hong Kong Express Link, or bus 629. You can reach Ocean Park directly by the bus.

Price of the bus : 10.60 per person
Price of MTR form Tsing Yi to Admiralty Station : About $11.50 (Adult ticket)
About $5.50 ( Children/student)

or you can take bus 70、75、90、97、37B by leaving the station by exit D. Get off the bus at the first bus stop after the Aberdeen Tunnel, the stop is called Aberdeen Tunnel Toll Plaza. After you get off the bus, there will be a park, follow the road and pass about two traffic roads, then you will see a bus stop, turn left and keep on walking, you will see the car park of Ocean Park, walk through it and you'll see the main entrance.
Price of the bus 70, 75 , 90 ,97, 37B : about 4.7 per person
* Bus 90 will pass through the Ocean Park at13:00- 19:00 every Sunday or public hoilday.
http://www.oceanpark.com.hk/html/en/plan-your-visit/transportation/index.html
the map form Aberdeen Tunnel to Ocean Park.

poor english but I hope I can help you, hope you can have a happy trip.
REMEMBER : Pay attention to the MTR line direction, for example you 'll have to take the Island line to Chai Wan direction.
http://mtr.com.hk/jplanner/flash_chi/index.php
map of the MTR lines

if you don't understand, all you have to do is reach Admiralty Station and take the bus.
If you lost, you can ask the MTR staffs or people..