From Los Angeles County:

Direct Route

10 Eastbound until you hit the 8th Street-Highway 243 exit at Banning. Exit South to Idyllwild. Follow it up the mountain and keep going. You go through Pine Cove and then you will wind up in Idyllwild.

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Scenic Route

60 East until you reach Gilman Springs exit and turn right. This will eventually run you into an intersection at Sanderson Road. Turn right. Make a left on Ramona Expressway. Follow this until it ends on Florida (the main road in Hemet). Make a left. You will now be going toward the mountains on Highway 74. Follow 74 until you run into 243 toward Idyllwild & Banning which is a left-curving exit on the road. 20 minutes more and you are in town.