Couples Trip Without Kids

When my wife and I got married young we didn’t have a honeymoon and we had our kids shortly after getting married.

Now our kids are old enough where the grandparents can watch them for a few days without any problems and we’d like to plan a makeup honeymoon.

What we’re looking for:
3-4 nights
Fly/Drive from the Philadelphia Metro Area
Budget $2.5K-$3.5K (Somewhat flexible but would like to stay in this range)
Anytime of year except winter (December-Feb)

We obviously have no problems with kids but would prefer somewhere with a more adult atmosphere, but we’re also in our late 20s and not heavy drinkers.

Good food is important to both of us, and museums/outdoor are a plus.

Some ideas we’ve had already are:
-Vegas
-Nashville, TN
-Charleston, SC
-Cancun

Our biggest objective is to relax recharge!

Any ideas are appreciated!!!