There are several fun and spontaneous things that you can do for a guy that you like. Being spontaneous is a great way to show him that you like to have fun. Below are some ideas that should impress him.
The Way to a Man's Heart
One of the ways to a man's heart is through his stomach. A fun and spontaneous way to show a guy that you like him is to bring him his favorite food or take him to his favorite restaurant. Taking your guy his favorite food for lunch will definitely make an impression.
His Favorite Haunts
Take your guy somewhere he wants to go. Make the outing all about him. Has he been wanting to see a particular movie? If so, take him to that movie as a surprise. A guy loves to know that you care about his interests.
Support His Interests
Guys like to feel special -- as do girls. Does the guy you like play a sport or instrument? If so, surprise him at his practice, next concert or game. By attending his events, you show him that you can have fun doing things he likes. He will feel that you support his endeavors.
Give him a gift. It does not have to be something expensive. A homemade gift is as good as a store-bought present. Be spontaneous and bake cookies. Buy that e-book he wants.