Thanks heather
I don't believe you can rent horses in the park. You can see if there are places in Divide that do trail rides there though.
Not sure on horses but yes there is a daily pass fee
Once upon a time, Mueller had horses in a stable in the park that visitors could rent and ride. Alas, that went away some time ago. For a while, they let people use the stable when bringing their own horses but it seems like the stable has closed from what I can tell. Regarding the daily fees, the only way to avoid that is to get an annual state park pass. Not worth it if you don't plan in going often but it is good if you are (or are planning other trips to state parks)
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