I am sure this was discussed before, but I could not find it doing a search and also with recent changes thought good time to clarify.

Here is the situation.
I need some Airline miles now.
If I do one of the travel packages, and decide not to use the hotel part, can I return it to Marriott?
If so, how much do they credit you account for?
So if I did a Cat 5 Travel package for 70K miles at 185K and returned the hotel certificate, Would they credit back 115K?