Figure out all the things you like to do that aren't expensive, and do more of those.
Vacations and cars seem to be the biggest expenses I see people make that I would be against. You don't need a 60 thousand dollar car. You don't need the BEST of everything.
Vacations can get super pricey. People always want to go overseas and whatnot. Maybe a couple times sure, go for it. However, there's probably 100 different cool and fairly inexpensive vacation destination here in the US that people never do, yet they go overseas.
Spending money doesn't always equal more fun.
So, go live for today AND tomorrow, and chances are you will be just as happy today and definitely more happy tomorrow
I'm a huge fan of traveling overseas, even if I haven't personally done so very much. I really enjoyed the time I spent in Korea and China, for example. I'd love to visit Japan, parts of Africa, and much of Latin America.
On the other hand, my wife and in-laws absolutely adore travelling to Europe, where you can do pretty much the exact same stuff that you can do in New York, Chicago, Miami, San Francisco, or any other major American city, while surrounded by American tourists in a place where everything is in English. Staying in hotels that are indistinguishable from every Marriott you've ever stayed in. I'm not
opposed to visiting London or Madrid or Paris or whatever, just like I'm not opposed to visiting Boston. But if I'm given the choice between an easy, inexpensive trip to Boston vs. a more logistically complicated and expensive trip to Milan, I'll take Boston all day every day. I just don't get the appeal of Europe.