What I like the most in my career so far are:
1) Growth. I've learned so much from the different jobs I've had and the challenges that come up. There are always learning moments, some are quick and painless, while others may take some time to get over, but either way, I get to learn and grow.
2) Great co-workers and friends. It's always nice to meet all kinds of people with different backgrounds, skills, personalities, and perspectives.
3) Ability to do stuff outside of work. Work-life balance is important, and being able to pursue my hobbies and passions outside of work is very important , and my career has allowed me to do that.