Sorry to hear Montana had to stay home. Glad you had a good time though. I love trail riding, makes owning a horse worth every oat and scrap of hay.
Cashel makes a nice tush cushion. I think they make them for English and western saddles.
On long rides I take my feet out of the stirrups whenever I can. Just dangling your legs, letting your hips stretch out and moving your feet/ankles around helps a bunch. We stop every hour and I always do some stretches, Back, inner thigh etc. helps too. I will also do some hip twists in the saddle. Arms out to the side twist both ways at the hip. I can't go more than 2-3 hours without getting off for a few minutes or I get really cranky.
"Until one has loved an animal, part of one's soul remains unawakened..."
- Anatole France