I have seen around 65 different lighthouses, three lightships and around 20 LSS's.

As far as a check list goes, I have just created a data base file where I enter the lighthouse name, first visit date, climbed or not climbed, and so on. It helps me keep track of these things when I acutally update it. That way, I can sort it by name of light, date visited, climbed or not climbed, or whatever.