That's often a bit tricky. Overnights should be with someone you have met before and know that you click with.  

In any case, be well rested, well hydrated, eat light (Think seafood. ), and be prepared for some disrupted sleep.  

It's also a plus if you are both cuddlers.

If not, I don't know what to tell you, but assuming you have, just treat it the same way, but know it's a date where you are guaranteed to score. Don't put so much pressure on yourself, just have fun and treat her like a "real" woman and you will be just fine.

On second thought, I do have some advice for you if you've never been on a "real" date like this, simply hand the reins over to your date. She has likely done this a hundred times so let her take the lead this time. Just relax and go with the flow, she may even like "being in charge"

Start with a nice hotel, great dinner, and wine then relax and let the evening play out. If there is any connection you will have a great time, if not all the planning in the world will not improve anything.