If you like Sylvia Plath, you should read Ted Hughes. I particularly like his Crow poetry.

For a short, slaping-my-forhead fun read I'd recommend Candide by Voltaire. It's blind optimism at its best.

Just about every library has a copy. :)

For poetry, Star Dust or Watching the Spring Festival by Frank Bidart. Star Dust if you're into long poems--nearly all in that collection are short, but one of the poems takes up half the book.

Have you read any of Dorothy Parker's poems?

#5 - Esperanto

Hmm, Ella Minnow Pea by Mark Dunn popped into my head, of course it's not concerned with Esperanto, but it uses language in interesting ways. It's fairly short, came out in the early 2000s, and hopefully your library will have it.

#3 -poetry

Perhaps you'd be interested in some wolf/werewolf "poetry"?? This book might be utter crap for a poetry lover, but it's the only *novel* I can think of that has a poetry base. You might find it interesting...I dunno.
Sharp Teeth - Toby Barlow

^^^both of the above books I mentioned I got @ my local library when I first read them, so hopefully yours has one or both of 'em, also. And I'd consider them "light" reads, which is what I'd want in your particular situation. ;-D