Aghh well what do you know....
O.K. JUST before he enters the cave (where I am) the player closed the lid on the box sitting outside. Stuck to the lid was the letter needed to get the balloon!
Also, before when I watched this video, I would turn it off as soon as he adjusted the sun disk and you hear the "KLIK" sound, as I did not want to see any spoilers.
Well as it turns out, in this guy's experience, it reveals a sign written in some ancient dialog...
...but when I played, that sign was there from the get go. How strange.
Anyhow, all I needed was to get the balloon, put it together, fill it with air, and I'm off the island.
Apparently this game does not play the same way, regardless of what path you pick because the guy in this video and I have both apparently chosen the same path, but the results were slightly different.
I was wrong on one thing though, like the guy in this video, I found my sun disk in a street drain, not at the Nazi Dig site.
At the Nazi dig site I found that statue that allowed me to start up the truck.
Anyhow, I'm back into the game again, and for those who have not played it, or have only played the old Amiga non-talkie version, I HIGHLY suggest you bust out ScummVM on MorphOS, or OS 4 or AROS if it is polished enough, and play this sucker!!!! It totally compensates for the lack luster movie that we were recently treated with.