Go see the horses in Corolla...don't know if the tours will be running--they were open air-jeeps with one company when we did them in the summer--but if you have a four-wheel drive, you can drive up there yourself.
WELL worth the trip and lots of shells on thoses beaches.
Pick up some of those ad books and they will explain the rules. Don't go near or touch--they are WILD--but DO NOT FEED! A colt died last time I was there because people fed it a carrot or something.
Also, make sure to hit "Duck Donuts" ...the best one is in Duck, but there are now locations all over. I don't even like cake doughnuts and LOVE them!
Have fun...we LOVE OBX!!!
We went there this summer for the first time based on a recommendation from other DISers. Best. Donuts. Ever. We liked them on FB when we got home and they were posting about closing the stores at 3PM on such and such a date and when that got people upset they then corrected their post that the only store that is open year round is the Kitty Hawk store and the other stores were closing for the season at that time on that day.