100 Ways to Slightly Improve Your Life Without Really Trying

From The Guardian, a list of 100 ways to slightly improve your life without really trying.
Our favorites:
9 Keep a bird feeder by a window, ideally the kitchen. It’ll pass the time when you’re washing up.
15 Keep your children’s drawings and paintings. Put the best ones in frames.
18 Reuse all plastic bags – even bread bags. Much of the packaging you can’t reuse can be taken to ... supermarkets for recycling.
25 Look closely.
31 Ask questions, and listen to the answers.
47 Take out your headphones when walking [running, biking] – listen to the world.
56 Call an old friend out of the blue.
63 Volunteer.
67 Sing!
70 Skinny-dip with friends.
73 Thank a teacher who changed your life.
82 Cook something you’ve never attempted before.
86 Nap.
88 Buy a bike and use it. Learn how to fix it, too.
94 Give compliments widely and freely.
97 Listen to the albums you loved as a teenager.
Many other wonderful suggestions here.