Its cheaper to send some of your items UPS than to have an extra bag and pay $35. You do need to have a drop off point at your destination for the UPS delivery.
We were on a cruise once and saw a Fed Ex truck outside the terminal when we docked - we were worried as we missed our original flight (due to Hurricane Francis - we had 2 extra days on the ship) that we would have issues with our luggage - so we sent ours home via Fed Ex - it made getting home and dealing with the airport and booking new flights so much easier!