OOOOOooooo. I like this question!
I love writing my reviews OF COURSE. Especially when the book was SUPER good or SUPER bad. It's so fun rambling on and on and getting gifs to really show how I feel. FUN!
However....in my heart of hearts...I think my favorite was when I used to cast some of the books I read. It was so fun digging up some actor/musician/somebody that best represented the character I was seeing in my head. Sighs. Not sure why I let that die out...maybe the amount of time I took and I was in college at the time and I had ZERO time to dedicate? Not sure, but I should bring that post series back. It was so much fun!!