Premise:
"The region was unproductive and without great resources, except for the Sarawak river valley, where the Chinese mined for gold and antimony."
Hypothesis: The Sarawak river valley was the only place the Chinese found useful resources in the region.

yes

Premise:
"Super-Paradise, in the next bay, is a gay, clothing-optional beach."
Hypothesis: Super-Paradise is a clothing optional beach.

yes

Premise:
"It's wise to buy a detailed map of the areas you plan to tour; these will also show you the smaller D roads, which are even more pleasant."
Hypothesis: The D roads are small but are another good way to tour the area.
yes