Alright...looks like there's confusion. Here's a little "demo" to help, because even I'll admit my description was a little hard to understand.
Hopefully this helps...
POST #1: SEAGIRT
Clue: Cape
POST #2: HAPPYPERSON
Answer: Hatteras (C. Hatteras being the first light that popped into Happyperson's mind when they saw the word "Cape")
New Clue: San Francisco
Post #3: LIGHTHOUSELOU
Answer: Fort Point (that being the first San Francisco lighthouse to pop into his mind)
New Clue: Ara-
Post #4: BOB
Answer: Arago (Cape Arago Light)
New Clue: Outer Banks
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END DEMO
Hopefully that gave you a better idea of how to play. The other questions:
Each "round" consists of one clue and one corresponding answer. The person who answers has to supply a new clue. The clues can ONLY be either a part of a name of a lighthouse (either a full word, such as Cape, or a part of a word, such as Ara-), or a region of the country (must be somewhat specific, "Lake Ontario" instead of "Great Lakes")
Let's start over with "NY Harbor". Hopefully this isn't a game that was better in my mind.