Sorry for the delay in getting this posted. The only "assured" place is the NC Aquarium (just kidding), but I know you meant in the wild.
Pea Island is a good place, as well as Oregon Inlet. In addition, they have been spotted in Pamlico Sound along Hatteras Island and Ocracoke. People have told me that the Village of Hatteras is a good spot to find them.
This may seem like a strange idea, but you may want to check in at the local bait shop wherever you are staying, because they will likely be able to give you more up to date information, rather than just general area information.
Good luck! I hope you find them and would love to see a picture.
Kind regards,
Dan
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Otters by: David
Dan,
Thanks for your suggestions. We'll be there Saturday! I'll let you know what we find.