Registering for Honeymoon...

The travel agency you are using will tell you that option. I have that (I used In and Out Travel), and basically they will give us a card that says we are registered for our honeymoon. Just like those from Macy's, Fortunoff, etc.
Your guests can give any monetary amount, or if they want to add something like a spa, they can. Then the travel agency will take down their credit card number and charge them.
YOu will know who give what and how much when it's time to pay in full because they will be keeping a list for you and your FH.

I am staying at all Starwood Hotels and registered through their site. Not sure if anyone will contribute, but it's worth a try!

Starwood Honeymoon collection

We were going to register for our Honeymoon too, but decided not to... We were going to go through:
The Big Day

Thanks!!!