B. Traverse
Normally, a speaker would use the word "move" as in "move forward" instead of "traverse forward"
Most likely: "A midwinter vacation at Club Tropic has its good points and bad points".
It sums up the basic points of the paragraph, and introduces the subject in a more or less general way. And by placing it at the beginning of the paragraph, and reading it out loud or in your head you can see/hear how it suits it.
