I saw this years ago, and was astonished when I first saw it. It is a bad film, with a hunt for some gem called The Ruby of Gloom. Why anyone would look for something with a name that dubious escapes me, but okay.
The outstanding thing in this film, the thing that stayed with me, was the pet of a boy who was a member of Captain Yankee's party. It was a hooded cobra. This snake was very bright: he could put Lassie to shame, even conducting a scouting mission for the boy. He was so bright, he spotted a lady snake and slithered out of the film before the action concluded.
Not bad. Just silly.