Have a great trip!! I am sure you will find someone right at PP who would love to have your stroller and then pass it on again when they leave. Just a note though, a stroller is a great thing to put your stuff on and drag through the airport, esp if you have a carseat. The airport is the ONE place we had to have the stroller because the lines can be so long, at least it is a seat to wait in. We got caught in that mess this August and short lines turned into 2 hour waits! My kids ended up sitting on the backpacks and scooting them along the line.
We flew to the other coast this summer for a long holiday with a week at the beach and then 2 more weeks sightseeing all around. A dad asked us if we wanted all his sand toys when we were riding in the elevator our very first day! We were thrilled because we didn't pack buckets (had enough luggage without adding buckets!) and the kids were so happy to have them. When we left, we asked another family who had mentioned they also flew in and they used them and said they would pass them on when they left! It was great!