I'm not intimately familiar with NGU/Chambers, but at NTU/Oceana, you will be well clear of everyone at 1000ft or below assuming you are outside the lateral confines of the airspace.....unless it is IFR and we are flying PARs, in which case the approach corridor will become a factor. Keep in mind that there is no minimum climb rate in the departure corridor of any real significance (highest obstacles are a couple hundred feet), so while most guys will climb at a pretty healthy rate up to the SID initial altitude of 4k, you could find an outlier climbing more slowly. Our initials (7 ish NM on extended runway centerline of approach end) are at 3k, so even at 1500 or 2500 you would be clear, again until guys start descending to 1500 ft inside of that for the overhead. Last thing is that if Fentress/KNFE is active, that can completely invalidate everything I've just said. Guys typically go down there VFR-ish at 1500 ft from NTU to NFE, and RTB at 3k on an IFR clearance......basically anywhere within 5-6 miles of NFE, and particularly the area between NTU and NFE, will be sporty if Fentress is being used. If nothing else, I'd heed this advice....I've personally had a couple close passes with Cessnas and the like who clearly didn't realize we were using NFE, and just blew through the pattern unaware, at pattern altitude, with 5-6 F/A-18's co-altitude. Well below average lookout and headwork for both those guys, but hey, it happens. Just something to be aware of if looking to transit that airspace. Hope that helps. Again, can't really speak to NGU or ORF, I really only get over that way in an airplane if I am on a commercial flight or a mil transport.
Though I'm sure the Norfolk/Chesapeake Bay tour would be cool and also do-able, I'd personally rather fly down the outer banks. Super scenic, and it looked really nice this afternoon just trolling around VFR down that way.