Thanks for the ideas!
Shamrock has so much personality and is so curious, I wonder if the ball might be fun for him too! Your horse certainly seems to enjoy it. :)
As for the trails, I normally ride alone and I'm confused as to whether I'm allowed to go out by myself. Other people go out alone, but I always thought the rule was that you can't. Whenever I take him on trails with other horses, he acts up a lot worse than if I just go out with him (I've done it a few times). The other day we rode with 2 girls to some new trails we just got put in and he was a mess, head tossing, prancing, etc. so I had to turn him back. However, I should've known better than to take him out on the trails that day.. The dogs went with us, which he hates. It was super windy, which freaks him out when in the trees. I just hopped on him and went, without working out some energy first. And it was my first time taking him over there. Maybe we'll try again under better circumstances. I'm spending all day out at the barn today, so we'll see. :)