We were in a similar boat (for different reasons). First and foremost, we really just wanted our friends and family to join us for the wedding. When we said "Your presence is present enough" on our registry, we meant it!
But we also knew that some folks would insist on giving us presents. In that case, we really, really wanted money for a down payment on our house. We used My Registry to create a customized registry. We were able to create a request for contributions to our down payment.
Honestly, that strategy wasn't particularly useful for us. The most useful strategy was simply telling our close family members about our preference for money, and then they spread the word when the opportunity arose. For example, if a cousin came to them and said, "What should I get Matt and Sara?," they were able to explain that we really just needed money for our first house. The vast majority of the presents we received came in the form of money.
You could also create a special registry for your honeymoon. There's a great discussion about this option over at Wedding Bee.
Enjoy your trip!