Mrs.Allison，
Mirador Mansion is very close to East Tsim Sha Tsui MTR Station. You can go to East Tsim Sha Tsui MTR Station on foot and walk to Tsim Sha Tsui MTR Station. Then take Tsuen Wan Line to Admiralty and Exit B to take No.629 bus to Ocean Park.

Ocean Park-Victoria Peak- cosmic guesthouse: take No.629 back to Admiralty and exchange Island Line to Central. Then go to Central Peak Tram Terminus. There you can take peak tram to Victoria Peak. After that, you may take peak tram back to Central Peak Tram Terminus and go to Central MTR Station to use mtr back to Tsim Sha Tsui and walk to your hostel. Or you can take No.15 bus to Central Star Ferry Terminal to take ferry back to Tsim Sha Tsui. Then get back to your hostel.

Cosmic to the Avenue of Stars: Just go there and go back on foot. The Avenue of Stars is not far from your hostel.

From cosmic to ferry terminal then to hongkong island and back to kowloon pier then to cosmic？
I suppose that you want to take ferry from Tsim Sha Tsui to Central and then get back to Tsim Sha Tsui. If so, you just go to Tsim Sha Tsui Star Ferry Pier. It is near to Tsim Sha Tsui MTR Station. Just go there on foot. There you can take star ferry to Central. After back to Tsim Sha Tsui Star Ferry Terminal from Central, you can walk back to your hostel.

Check this page to learn ferry schedule: http://www.nwff.com.hk/eng/services/CFT_M/?section=Macau

Cosmic-Macau: You can go to China Ferry Terminal near China Hong Kong City to take ferry to Macau Maritime Terminal. Then you can get back to China Ferry Terminal from Macau. And you can walk to Cosmic from China Ferry Terminal too.

Cosmic-symphony of lights: you can go to the Avenue of Stars to enjoy SOL on foot and then walk back to your hostel.