Welcome, ddong c-tse.
I'm also a new comer who started running recently.
Hiking is not my favorite as it require several companion for safety reason.
Running is easier, you can run by yourself or invite some of your friends or family members together.
If there's chance, you can join some of the senior c-hing or c-tse to run at different spots in HK.
I'm sure you will enjoy the running and the beautiful view of various districts in HK.
By the way, please check out the following link (香港長跑網一週年特刊):