I bought her a giant (and inexpensive!) magnifying glass off of eBay for her exploring adventures outside.
Let me tell you - it is the best toy I have EVER purchased. It keeps her (and me!) interested for hours on end! We look at plants, bugs, our hands and fingers. She even put it in our church activity bag on Sunday and it kept her (sort-of) distracted until it was time for her to go to nursery.