Question: fun things to do for your birthday by yourself?
Answer: Start Fresh. Use this opportunity to start fresh in some area of your life. ... 
Be Generous Toward Yourself. If you aren't expecting anyone to give you gifts, treat yourself to something new. ... 
Take in a Movie. ... 
Volunteer Your Time. ... 
Read a Book. ... 
Go About Your Routine. ... 
Plan a Party for Next Year.