The author traveled to Mohonk Mountain House, an all-inclusive resort in New Paltz, New York.Joey Hadden/Business InsiderMohonk Mountain House is a historic all-inclusive resort in New Paltz, New York.I booked a two-night stay there in July and made three mistakes.I regretted traveling solo and wished I'd brought my own snacks.Mohonk Mountain House looks more like a castle than an all-inclusive resort. Located in New Paltz, New York, this histor…