Hi N M Pickett,
Have you asked your son what he has done in the past year that was the most fun?
Has your son been to any 13th parties lately? What does he say about them?
Have you spoken with a few of your son's friends? They may have some good ideas for you.
If your son likes sports, you might want to have the party at a sporting event. See if the local sports teams offer specials like putting your son's name on the scoreboard or inviting him to the field to meet some of the players, etc.
If your son likes swimming or boating you might have the event at a pool, lake, ocean, etc.
If your son likes camping, you could organize a camping trip.
If your son likes bowling check with a bowling alley in your area.
You might look at the Making Events Memorable
forum right here on Eventective.
You might look at the posting Cards, invitations and Signs for a Special Birthday Surprise
on Slideshare. You might also look at the posting A Special Birthday Surprise
Let me know if I can be of further help.Ron
Ronald G. Shapiro, PhD.