Let's get back to « No need to know – 1.5 ».
It took me some time and research to find this one.
At 19:30, Magnum, with Rick's help, broke into Samson's bungalow and is reached thereafter by American CIA agents.
Since i am not an Hawaïan native or resident, i called this one the « mysterious bungalow ». The only hint you've given, in that episode, is that Samson (IRA's operative) hide somewhere at … Waikiki...
… strange place for a covered terrorist, indeed...
here are the screen shots....
https://ibb.co/Lzj3Z4B
https://ibb.co/CMc0d8Y
https://ibb.co/89LWHd4
https://ibb.co/3sm6fcD
https://ibb.co/ByfVZXW
https://ibb.co/kSHZTkG
https://ibb.co/RTrhnYh
https://ibb.co/8zQyyqy
No wide angle shot, so not easy to spot...
… especially if you consider it was filmed 40 years ago...
From my knowledge, there was one main hotel at Waikiki directly opened to beachfront with bungalows complex at that time.
Pay attention to these two pictures :
one from the episode (again)
https://ibb.co/Lzj3Z4B
The other, an old 1930 postcard...
https://ibb.co/0QW2K8s
Yes you got it ! Same stairs, same stone basement and first floor opening, windows, stairs railing, flowerbeds from each side, roof rafter...
That is one of the bungalows blocks from the mythical and well known (forever gone, it was torn down


From that shot, i guess it is the left side bungalow complex (when you're staring at the main house of the hotel from the parking/road).
I was not able to pin the accurate filming location for the « break into » scene on that old 1957 Hotel plan (direct seaside balcony ; 'coffee' terrace with palmtrees ?). However i materialized what seems to be the establishing shot traveling with this little red curved line.
https://ibb.co/k2TStD7
Again, not a real smoking gun, but i might not be so far. Any help ?
Thanks for reading !

EDIT nov. 15 2020.
In order to note the whooping and drastic evolution of waikiki beach front, i post this comparison between a USCG 1952 plane view where i underline Halekulani Hotel bungalows zone and today google earth view... 'concrete walling' aside, you can see that the beaches shrinked by a significant measure.
https://ibb.co/mzNNFzQ
Here is also a 1968 bird eye shot.
https://ibb.co/JvhQ9tS
Sometimes progress doesn't mean better welfare or environmental conservation ...
bye.