As a mom, I am at my best when I make sure to take time for myself. Through reconnecting to the things I love outside of being a parent, I achieve happiness that in turn affects my emotional state throughout my day or week. I am able to face those tantrums with a cool head and don't get as frustrated by the 4th milk spill of the day.
This is especially true when traveling. My husband and I make sure to give each other a night or afternoon off to wander free and connect to the place we are traveling as adults. Both of us enjoy alone time and mini adventures while the kids are safe at the hostel with the other parent gives us the respite we all need. These breaks helps us fall in love with our destination not as a parent, but as an adult.
Sometimes the simple act of taking coffee to the porch for quiet time before the kids wake can help center me to face the day.
What ever your activity may be, don't put it off or undervalue it. Don't feel guilty about needing to de-stress and find your way to a calm and happy state of mind. This will lead to a calmer and happier parent and happier kids in the long run.