Our first was at Sea Pines on Hilton Head Island. We were alittle disappointed that it wasn't a "real" lighthouse. So we went to Tybee Island but it was raining VERY slightly and they wouldn't let us climb it. So we went to Hunting Island and climbed it. Cape Hatteras was the first "active" lighthouse that we climbed and the one we've climbed the most.
Don't know the number that we have climbed.... but I know we're not done yet
We're hitting the Ohio state shore line on Lake Erie in June on our way up to Niagara Falls so I hope to add a few to the list....