1. to disneyland: take mtr from fortress hill to Central and walk to Hong Kong station of Tung Chung Line. Get on the train and get off at Sunny Bay. Then take special disney line to the park. The cost is about 24HKD for 50 minutes.
2. to Ocean park: take mtr to Admiralty and then get off at Exit B2 to find bus 629 to Ocean Park. It takes 5 10.5HKD and takes nealy 40 minutes.
3. the Noah's Ark: take mtr to Central and then get to Central Pier 2 to take ferry to Ma Wan. I have no idea about the ferry ticket.
4. to Snoopy World: nearby Sha Tin mtr station. The route by mtr is Fortress Hill - Admirlaty - Prince Edward - Kowllon Tung - Sha Tin. 16HKD for 40 minutes.