Horse games?

My three-year-old, Bandit, is very obviously getting bored with his usual ground work. He'll lunge both with and without a lunge line, he'll lay down when I ask him, he'll jump into trailers like they're nothing (and he'll even jump in the back of the truck and lay down), he sidepasses, bends.... everything I could think of to teach him, he knows. I'm working on teaching him to pull a cart -- so far all he needs is some work on ground driving and then I'll take him out on the trail.
Are there any good exercises I can do with him? Just something fun that might entertain him.
Oh, and I wasn't planning on teaching him to ride, so nothing like "get him used to a saddle" or anything.

I'm considering teaching him to do small jumps on the lunge line, but... I have to find some jumps first.

Do you have any ground poles or cones? I'm thinking play obsticale course with him. Have him go over poles, around cones, anything to change things up a bit. Maybe step it up and add some desensitizing. Get him used to walking over tarps, past a flag or something else scary. If he's bored, he's probably smart and a fast learner. I say take advantage of it.

I don't have any cones or poles, but I can get a handful of bamboo poles, and something to substitute for cones. I guess I never really thought of an obstacle course... I might just try it. I'll have a hard time finding scary things, though... I've already desensitized him to everything I could lay my hands on... tractors, ATVs, dogs, stampeding cattle, a small airplane, bags, tarps, being blindfolded, chainsaws, my dad and I's famously huge bonfires, fireworks... I'm running out of things that he could've been afraid of. I even got bored one day and ponied him up to a nearby restaurant and through the drive-thru so he could hear the speakers and the windows opening and stuff. O.o'
If I come across something he spooks at, I stop right there and get him used to it. And on days when I get bored and have some extra time, I go out looking for 'scary' things.

I did start him jumping on the lungeline the other day... just a couple little logs with a barrel on the outside of the jump (so he can't go around it). He started jumping them almost automatically, then my friend acidentally knocked over a barrel, and he jumped that, too. X3 Only hit the logs once or twice, and he dodged around them once. I'll have to find some bigger logs or a better makeshift jump sometime... But for now, he seems to be enjoying himself.

Do you mind me asking why you have a young horse that you don't plan on riding?

No, I don't mind. He's too small for me to comfortably ride... somewhere between 12 and 13 hands; the smallest horse I'll ride is his dam, who's 14 hands, and that's only to keep her from getting lax in her training (she's the "beginner's horse" of my herd). I considered breaking him to be a kid's pony, but I wouldn't know how to go about doing it, so I decided I'd just break him for harness instead. So he has a little cart that he's learning to pull around. His brother, Dante, is destined for the same training, for the same reasons.

LOL! I can picture him going up to the drive thru window! The people working at that restaurant must have been a bit surprised. Maybe you teach him some tricks? Counting, bowing, stuff like that?

They're used to me by now... I ride to the local pizza parlor, bar & grills, and that drive-thru on a regular basis. They were a bit surprised that I was ponying him with me that day, and a couple of the waitresses came out to feed him carrots.

Hm, I taught him to lay down... mostly by accident. I'm not really sure how to teach any other tricks. There's a book at the tack shop I work at that explains all that, but I have a hard time learning from books. You don't know of a good video, d'ya?