You will do just fine! Enjoy yourself and try to stay as active as possible! That does not only pertain to the bedroom either!
Yes, I even mean the bedroom. Enjoy the delicious foods, but also take advantage of the healthy + pricier items like the delicious smoked salmon and all the fresh fish selections. Also, I'm sure there will be lots of yummy veggies like asparagus that they will serve with the prime ribs, etc. Just trim the fat and you're good to go! I doubt you will gain a single pound. Just make sure to enjoy yourself and don't overdue anything (like eating 4 slices of cheesecake just cuz it's there
Trust me, it won't be *that* different than if you were at home. Just make sure the choices you make are both yummy and on the healthier side. If you just keep that in mind, you'll be just fine!
Have a woderful honeymoon!!!