How do I get to Ocean Park from Ah Shan Hostel in Mongkok ?

Walk from your hostel to Mong Kok MTR Station to take Tsuen Wan Line to Admiralty Station, near which you can easily find bus no. 629. It can take you to the destination directly.

As for the ferry, take Tsuen Wan Line to Tsim Sha Tsui and walk to China Ferry Terminal to catch a ferry to Macau. The ferry duration shall be around an hour and the interval is halfan hour. It costs 159HKD for an ecomomy class cabin and 282HKD for an super class cabin in weekdays and 175HKD for an ecomomy class cabin and 289HKD for an super class cabin at weekends and holidays.

Thanks for the quick reply