I got some hot cash several years ago unintentionally. After that, I set up 3 goals:
1. Maintain high quality life
2. Improve skills for my career
3. Meet more interesting friends
With these three goals, I did these:
1. Maintain high quality life
1.1. I bought myself a lot of insurance, both financial and life
1.2. One nice apartment
1.3. Put about 20% to some low risk fund
2.1. Best keyboard, chairs and ... as a developer
2.2. Books
2.3. Donate some open source projects and make friends with contributors
3.1. Host regular meetups of great developers in China
3.2. Go to a nice gym as I find people who work out hard and keep self-discipline are normally class-a players
3.3. Get much more opportunities when focusing on what's next than what you're paid