Don’t say: 
– My vacation was really funny.
– We did lots of funny things together, like partying and going to the beach.

Say this:
– My vacation was really fun.
– We did lots of fun things together, like partying and going to the beach.

Remember:

• Fun is something (or someone) that you enjoy.  We all had fun at the picnic.  He’s fun to be with.
• Funny is something (or someone) that makes you laugh.  He knows a lot of funny jokes.  Three funny movies (comedies) are Airplane, Blazing Saddles, and Monty Python and the  Holy Grail