His main house is in the Santa Monica mountains and is half way between Malibu and Calabasas. The address is Calabasas. The Hawaii house is in Kauai.
Unfortunately, there is no way you could accidentally bump into him in either of these remote locations...you would definitely be ID'd as an adoring fan pretty quickly. Best to stick with hotel lobbies on Eagles tours or outside of small venues after his solo shows - when he has security with him and is expecting to see some fans!!