Is there a horseback riding service in the Park?

Yes, there are a few outfits in the area. We were there last week 😉🐎

I just left there 2 weeks ago. We used great northern resort for a saddle and paddle excursion. We did the steak dinner on the raft pm ride and it was great. Highly recommend. Pricey for both however very nicely run. Enjoy

I was at the park about a month ago and there is an outfitter for horseback riding just inside the west entrance. I did not utilize them but I did see that they were active and on the trails.

I don't think so. Haven't seen nor heard of such a service.