Adjectives! Again and Again. and Again.
I can repeat the adjective sections for quite some time without getting bored. Why is that? every other section drains my patience fuel and constant errors frustrate me to the point of punching a hole through my screen. Is it the simplicity? (but they're all simple, to be honest). This applies to all languages I have learned; I would go as far as saying the adjective sections are FUN... Any linguists with a clue?