I just received the script for "Don't Eat The Snow In Hawaii." I've only read the first 13 pages, but it is very interesting. Most of what is in the script we see in the pilot, however, there are some interesting omissions. Pages 1 through 13 go from the opening sequene (describing the the Pacific and Magnum swimming, just as we see him in the pilot) to where Magnum drives through the gate.
Did you know the original name for the show was not MAGNUM. According to the script it was "CUTTER."

In the script itself, I even saw a reference to Cutter instead of Magnum.
In the opening sequence of the script, Zeus and Apollo are more vicious than they actually appear in the pilot. For example, the script has them tearing the tape recorder apart in a frenzy. In the pilot, I think one of the lads picked it up in his mouth and brought it to Higgins.
The first shot of Inge and Greta in the script are in bed, (nude

) not in their bikinis as in the pilot.
In the script, Robin inherited Higgins from his English Uncle, and indicates that Robin doesn't like Higgins, although Higgins doesn't know that Robin doesn't like him. During the opening scene, Higgins thought Magnum was trying to get Higgins fired.
The sequence where Magnum flashes back to Vietnam before he picks the lock on the beach gate is just as we see in the pilot. However, during that scene when they are waiting for TC to pick them up in the chopper and one of them says I wonder if TC forgot to set his alarm. At this point in the script, it flashes forward to TC waking up to an alarm and lights a cigarette and makes a phone call to call Robin's Nest as a diversion to keep Higgins occupied and help Magnum get onto the estate. TC dials Robin's phone and pretends to be someone calling on Robin's behalf and asks Higgins to wait for Robin to get onto the phone. TC then puts the phone down and goes back to sleep while Higgins waits on the phone.
In the pilot, Magnum starts to drive the Ferrari toward the gate and he says "Higgins you yo yo" (which was obviously added in post production). The script has Magnum saying "a_ _hole" instead of yo yo.
In the pilot, when Magnum drives through the gate followed by Zeus and Apollo, the lads don't make it outside of the gates before the gates close (although one of the lads almost gets decapitated when the gate closes on his neck). In the script, Magnum continues to race out of the estate and down the road followed by the lads. The gates closes behind them.
The scene that we are so accustomed to seeing when Magnum pulls over and removes the Ferrari top before speeding off is not in the script. The dialogue is there, but it has him saying this while driving down the coast.
It is interesting comparing the pilot to the actual script. Some of the dialouge in the script was either omitted or changed for the pilot. However, I was most surprised to see the description of Higgins. It seems that he is merely tolerated by Robin, not respected, as we have come to know Higgins in the series.