My horse hates the arena with a passion. I swear if he could talk when we ride in an arena he would be cussing me out, im not even kidding, he's a holy terror in an arena, but I can take him out to our neighbors pasture(its like a mini forest) and he's a completly different horse! He's also a little bit of a speed demon so we kind of take the trail a bit faster pace than the normal trot or canter...*cough* and staying on my horse through that pasture at that speed is crazy but its fun, he likes it I like it,
Every horse is different, they look at things differently, they think differently just like people, one person that likes to paint, could love to skateboard, we just have to find what suits us and go with it no matter what anybody says.
I personally agree with my horse, I don't like the arena either but sometimes its necessary to work on some manners or new things to try on the trail even, or I know some people who barrel race and rope and all that, they take their horses out on trails too, but both them and their horses like to barrel race and rope so it all depends on the horse and the person
My horse was started on the trail, and if I can make it possible he will still be doing trail until he can't hold a rider anymore and then im going to walk him out there, my trail horse means that much to me