Season 4: Many Happy Returns
(after the hivercraft was stolen in the beginning of the episode)
Driving scenes during Michael's vacation:
Lake Casitas (Route 150), Ventura, CA
Latitude: 34°23'20.41"N, Longitude: 119°21'37.16"W
W Paseo Del Mar, San Pedro, CA
(near Angeles Gate Park and Point Fermin Park)
Latitude: 33°42'35.13"N, Longitude: 118°17'47.63"W
This road also looks like the final scene in
"Trust Does Not Rust" where KITT encountered KARR.
complex junction of Highway 101/1 and railroad, Ventura, CA
Latitude: 34°17'36.89"N; Longitude: 119°20'23.35"W
Here is another scene during Michael's vacation:
It might have been filmed at "Morro Rock" (HW 1) or "Rincon Point" (HW 101).
Scene: Twelve Palms Hotel
Coast Long Beach Hotel
700 Queensway Drive Long Beach, CA 90802
Latitude: 33°45'23.59"N, Longitude: 118°11'53.21"W
(Left: 1985) (Right: 2008)
You can see two clues in the background of the swimming pool:
white birdcage structure (left, small circle)
Shoreline Village at Long Beach (right, large circle)
==> see the locations in "Knight Behind Bars" in this thread
This is how I discovered the location of the "Twelve Palms Hotel".