It would depend on the trails, for example, I'm an big hill rider and the parks close to me don't have hills. But to me $40 would be an little high. I can camp with electric somewhere $17 a night or even less. So I wouldn't but the gas to go to the place with Hills normally doesn't even cost that much. We are planning an camping trip. Friday to Sunday so two nights, $15 an night, $2 per horse per day we use arena (will be about 4 to 16 for the weekend) and then $25ish dollars one way. So for us it wouldn't be worth it unless it was good trails, but maybe ask around your area.
Extreme Trail Rider and Barrel Racer.
King - 11 year old Tennessee Walker Gelding
Sassie- 7 Year old Appaloosa Mare