I don't know what happened to your Park Inn sorry
I have never been to Minca, but it's only 45 mins (ish) from SMR isn't it?
I know that Pro Aves works with a hotel in the town (I think it is called Hotel Minca) and can provide the transfers to the hotel and then onwards to El Dorado the next day. So I'd be inclined to just follow their advice regarding that transfer and somewhere to stay in the town.