What have been the best self-improvement things you've done?

[WEL]

I'm on a MASSIVE self-improvement kick this year. I'm really trying to get things figured out and nailed down. I've done some great things thus far but would like more ideas:

• I'm getting my car in really nice condition. It's a 1999 so it was a little worn but now it's looking almost like new. It's a really good feeling to have everything sorted. Up's the resale value as well.
  
• I eat really healthy. I haven't had desert in 10 months and I've stopped missing it. It's great!
  
• I drink plenty of water.
  
• I'm adopting a positive mindset. My head is positive - the struggle now is making sure not to say negative things.
  
• I've learned how to keep a tidy home. THAT is life-changing, btw.
  
• I read a self-improvement book/month.

What else should I do? I'm all about getting better each day!