There is a handshake (I'd tell you how I know but then I'd have to kill you)
Freemasons are not that secret anymore. They do a lot of charity work, it is a bit of an old boys club and some 'Lodges' are struggling for membership because younger generation are less into it.
They practice a 'ritual' - bit like a play or for those that are CoE or catholic I imagine it's similar to some rituals for those religions. They have aprons which signify their standing in the Lodge. Their status is also reflected in the part that they play in the ritual .
They have social meets (dinner and chin wag) and business meets (where they learn lots of lines for the ritual)