We also love Utah and have a condo in Park City. Update on the prior posting; many of the lift operations for hiking/biking will not be operational in October. By then, the mountain tops will be getting snow (we hope!). Still, good hiking and mountain biking are available. Check out the Uintah mountains, just northeast of park city, for great hiking areas. Also, try Antelope Island in the Great Salt Lake for an interesting adventure. You can drive onto the island and hike around from various points.
You'll fall in love with Utah too.