Magnum PI was one of the great fun to watch shows of the 80s. My wife used to watch an episode everyday in reruns while looking after the babies. Anyway the show Magnum PI really was filmed in Hawaii and if you go north on Oahu you can find the house that they used to film Tom Selleck in all his hairy chested greatness.
The picture to the left is a picture of the entrance to the house. This is important to know as the house is unmarked and very hard to find we thought.
There is always confusion about where the house is and we saw a listing in the Lonely Planet guidebook for Hawaii that said what general area to look for the house. After we got back from out trip to Hawaii we had a lot more luck in seeing exactly where the house is and we got pictures of the wrong house while we were there
Anyway the location of Magnums house on Oahu is close to the Waimanalo Beach Park on the Kalanianole Highway. You take the highway between the beach park and a pier close to the Kaupo Beach Park. It is easy to miss the area but you just have to keep driving the 5 minutes or so between these locations and you will find a string of houses. Pull over and get out of the car and just walk down the string of houses and you should be able to find the house. The map below should help.
For more info there are two great resources on the internet. For actual info on how to find the house you can go to finding Magnum PI house (which includes lots of pics) and for more info on the history of Robin’s Nest you can go to Magnum Mania.