1. When someone asks you to do something, make your default answer “yes” (but don’t forget to say “no” when appropriate).
2. In a gathering (class, conference, etc.), sit next to someone you do not know.
3. Visit a place you normally wouldn’t (museum, monument, national park, etc.).
4. Eat at a new place.
5. Try a new kind of food.
6. Go to a conference or seminar in a topic you are not familiar with.
7. Email or call an old friend you haven’t met for a long time.
8. Initiate conversation with someone you don’t know.
9. Find the most unpleasant task in your to-do list and do it first.
10. Email or message someone you don’t know to initiate a friendship.
11. Learn a new hobby.
12. Learn a foreign language.
13. Join a new club and interact with the people there.
14. Practice an art you normally wouldn’t (painting, music, etc.).
15. Learn a new musical instrument.
16. Be dare to ask. This is to familiarize yourself with rejection.
17. Read fiction if you normally read non-fiction, and vice versa.
18. Read a new author.
19. Read an old book.
20. Visit a new genre of blogs.
21. Find friends from a new country (i.e. a country from which you haven’t had any friend before).
22. Find friends from different professions.
23. Volunteer for activities conducted by your social or business group.
24. Do your groceries at a different store.
25. Take a different route to work.
26. Attend an art festival.
27. Listen to a new genre of music.
28. In a bookstore or library, browse books in a section you wouldn’t normally visit.
29. Watch a new genre of movies.
30. Read history more than news.

Via lifeoptimizer