For me it was visiting places where the people practiced the joy of living. Where I'm from in Canada, there is a societal structure that we just accept in our day to day lives. How we do things. When to do them. What is considered "normal".
One is to enjoy lunch!
When I went to Switzerland, I realized that many people take some designated time to sit and enjoy some food, with the ability to hit pause on their work day. (I think many Europeans do this?) I know many Canadians and Americans can understand what I mean: expectations to eat on the go. When I came home, I incorporated this into my life. (One of my managers from Toronto was none-too-pleased that I started having lunch during my workday, expecting me—like everyone else—to work through it.)
[Another is pampering ourselves during mealtimes.
During my travels while in Switzerland and Germany, I noticed many everyday people enjoying the beautiful things they had on a daily basis. They used lovely dinnerware, washable serviettes, and to sit at a communal table with family/friends. Where I'm from, it's common to only use the good dinnerware for holidays, and use paper towels for napkins. Thanks to the influence from my German friends, who told me that it's okay to enjoy myself during every meal.
Transportation.
My time in Germany made me realize how much I overused my car, as many Canadians do. When I came home, I did purchase a bike, but it was not suitable. I kept it in the back of my mind to someday make a better purchase, and that did happen about 15 years later. Now, I feel so much more connected to my environment and feel more accessible to interacting with my community while on a bike. With the added fresh air and exercise, I feel so much more healthy and sleep better.
Lastly, if you feel like it, do it.
I'm going to credit California for this, where the laid-back attitude is definitely a thing. Whenever I visited my relatives in the Bay area, they never seemed stuck in doing things just because it was the weekend. If they felt like cracking open a bottle of champagne on a Monday, they did. The reason: "it's Monday". As one friend said to me, "Champagne is just wine, right?" Going to the beach after work, or having a barbecue at 10pm, or wearing a bikini even if you don't look "perfect" were all very Californian attitudes. I loved it. I would always come home, feeling refreshed and reminded not to feel so rigid in taking in such pleasures.