Thank you, all, for these suggestions. Very helpful.

Actually, it does not matter what you do; just do something and get yourself busy whether alone, with your partner or with your friends, that can give you pleasure

Fully vouch for this, when you are still in a position to fly long distance and walk without back pain; do travel more and enjoy life

Can you do it if you have both time and money; and if your partner shares your enthusiasm?

My brain is a bit rusty now. I probably opt for traveling and tours. 读万卷书不如走万里路

Try these links for elder academy: https://charm-retirement.com/classes/

Can pick up new hobbies; volunteer in NGOs, learn new skills or knowledge; most HK universities have curriculum of courses tailored for retirees..

Can try the following link: https://charm-retirement.com/classes/

Any recommendations on where I can learn and enjoy ballroom dancing?

Agree, I know quite several people pick this up after retirement

I recommend ballroom dancing as you can do that with your life partner too.

golfing, tennis, swimming, or even learn ballroom dancing can be fun, if you can find a good place to do these

Try this website for details of HK hiking trails http://www.hiking.com.hk/hikeframe.htm

Find something useful to do, either alone or with your friends. Hiking country trails with friends or join a social group with the same interests is a popular choice

Hi, I have just retired. No meetings and office e-mails makes me feel uncomfortably free all of a sudden. Weird feeling!!