Learn French: Ce manège est si intense que je pleure. - This ride is so intense that I am crying.

They form the French equivalent of "so... that" to express intensity and its consequence. You put si (so) right before the adjective intense, and que (that) right before the result (je pleure). You could also use tellement instead of si here: Ce manège est tellement intense que je pleure.

Why is it ce manège and not cette manège?

Manège is a masculine noun, even though it ends with an -e (which is often a clue for feminine words). Because it is masculine, we use the masculine demonstrative adjective ce (this) instead of the feminine cette.

Does un manège only mean a "merry-go-round"?

While it does mean "carousel" or "merry-go-round", in the broader context of a theme park or funfair, un manège refers to any amusement park ride, including roller coasters or drop towers.

Why isn't je pleure in the subjunctive after que?

The structure si... que introduces a factual result or consequence (the ride is intense, therefore I am actually crying). Because you are stating a real fact rather than expressing a doubt, desire, or emotion about someone else's action, you just use the normal present tense instead of the subjunctive.