If you're nervous about climbing lighthouses, this is a good one to start with. It's not very tall, and when you're at the top you are completely enclosed in the lens house, so you're not out on the railing. Plus, there is a really nice fellow who greets you in the lens room and talks to you about the lighthouse (and others - he knows his lighthouses!) as you enjoy the view and get up close and personal with the lens.
The ladder at the very top of the climb is steep, but it's only a few steps, and the attendant is there if you need a steady hand as you emerge. The rest of the climb is easy.
The lines on the inside of the tower that show the waterline for various hurricanes will really make you stop and think.
The whole thing only takes about 15 minutes or so, and they regulate the stream of people to keep it from getting crowded at the top and to keep people from going up and down at the same time.
Admission fee is $5. Very reasonable; you get to see and support this unique piece of history.
Note: Visiting hours are currently Monday through Saturday at 9:00, 9:15, and 9:30 a.m., if weather permits.