I agree with Mark on staying at Pirate's Cove - took my boat down there for a week in 2001 and loved it!
EVERYTHING (gas, bait, tackle, ice, food, etc.) you need is there and it IS very secure! We rented a home on a canal there and the boat was tied up DIRECTLY behind - about 20-25ft. away. The "slip" (25ft. of dock, water faucet, maybe electric?) was INCLUDED with the rental. You CAN keep your trailer UNDER the place you rent - if it FITS (mine did). Otherwise, they have (or use to have?) a LOCKED, FENCED-IN area nearby in Manteo to store trailers.
There's the public ramp right across the road for unload/load, and a SHORT run under the bridge to PC - depending on which canal you are nearest. We stayed one canal over from the marina.
The run down to OI by boat is 30min. or so - depending on how fast you want to get there. The public "beach" (ocean) is only about a 10min. drive from PC.
PC 'ain't cheap - especially during the summer - but it's VERY nice to have the boat READY to go and all the other amenities of the place! VERY nice!
Book EARLY (although they MAY make you wait 'til Jan. 1???) to get what you want!
There are condos, smaller homes, larger homes, and BIG homes in there - lots of options! Plus, you can do some moonlight crusing and fishing in the Sound closeby or cruise up to Manteo and the waterfront.
Regards,