If you choose, fire road up and singletrack down.
This area offers some fabulous mountain biking in Coeur d'Alene. You can take the fire roads up 2-3 miles then attack the awesome roller coaster singletrack back down. You can also spend the whole day on nothing but singletrack. There are many trails here and they are all well marked so getting lost isn't an option.
How to get there:
From Post Falls head East on I-90. Take the 15th Street Exit in Coeur d' Alene and turn left. After about a mile, turn right onto Nettleton Gulch Rd. At the end of the road you will see the parking area and the entrance to the trails.