Per a test-solver: "In 29A, the words that you think rhyme, don't exactly rhyme." It was specifically mentioned that if I say "pin" and "pen" the same, I would hear them as rhyming. Funny thing is that I had a friend in college who would make fun of me for EXACTLY that. Sorry!
When I saw Kew Gardens, I thought it'd be about my hometown NYC. Should've known there'd be something more clever than that going on! Great theme. Particularly HIDEANDSQUEAK. My 4 yo is going to love that when I tell it to him as a joke. Great puzzle!