just look at what the cost of the UPH for the 1 night less than what your stay is actually for, and that's the amount. For example, if you're staying 6 nights/7 days, look at the cost for the UPH for 5 nights/6 days.
Also, you can only do this if you purchase the UPH at check in (or after you arrive). This cannot be done with an advance purchase UPH.
edited to say I didn't notice you said with the dreammaker package, I'm not sure how it works in that case as I believe you have to purchase the passes at the time of booking the package. Sorry, what I wrote above is if you purchase the UPH freestanding from a package...