Things that make me feel like a million bucks:
My wife: She's kind, fun, easygoing, intelligent, frugal, successful, beautiful, active. Every time we go out to a social event together, I always leave thinking "wow, my wife is the best!".
My kids: 2 and 5 now, they are healthy and are developing very well. My five year old son is a sweet, kind, fun kid who loves making crafts and being silly. My 2 year old daughter is a spunky high energy girl who loves to play and talk with everyone.
Our Friends: Our closest friends are very fit, happy, ambitious, great parents, and just love life. Particularly our neighbors two doors down. We are around them constantly, they have kids our age, and they are basically MMMer's at heart despite probably never hearing of the site.
Financially: We are miles ahead of all of the people we teach with. It isn't a race or a contest, but it is easier to feel grateful and rich when you are in a relatively better position than almost everyone you are around when you show up for work each day. Our net worth is growing at 10k per month because we spend so little and our investments are starting to snowball. It amazes me how even in months where I feel spendy...maybe we spent a couple hundred bucks on something we normally wouldn't, it just never moves the needle.
Living a full life of simple things: The things that make my wife and I happy...being with each other and our kids, reading, biking/running, going to parks/playgrounds/the beach, campfires in the back yard with neighbors, inviting friends randomly to eat dinner with us and having them reciprocate. All of those things are REALLY cheap. People with expensive tastes have to ration their fun and save up for the next time they do what they love. But we don't have to save up for the next bike ride to the lake, or the next campfire at the neighbors with a beer or cup of hot tea on a cool summer night, or the next time we get a book from the library. Other's might find it to be a sacrifice to send 60% of their paychecks to their investments, but we have unlimited free sources of happiness every day, so we don't really have to make a trade-off, it's just win-win.