UPH tickets can't be converted to any other sort of tickets... they're really tied to the dates of your hotel stay. In most cases, they expire at midnight on your checkout date.
Park Hoppers and Park Hopper Plus tickets CAN be upgraded or traded in toward Annual Passes or Premium Annual Passes. Within 7 days of the first use, you can upgrade them, and have the full purchase prices applied toward the AP. After the first seven days, you can have the prorated value of unused major park admission days credited toward an AP.
(There are a few other rules about how this works...)