I also put it in the confirmation email I send with the confirmed reservation and a house manual I attach. People still arrive and ask for it. Mine is long so I tell them to cut and paste it to their computer or mobile device before they arrive. About half do
Before you ask - I dont want a shorter one for security reasons and no it isnt easy to change it as I have it running on an a belkin extender and the last time I changed the network and reset up the extender it took hours to get it working (not because I am technically inept I have a degree in math and computer science it just wasnt easy to get it working). A few guests have told me I should change the password for a shorter one. A few other guests IT professionals like me have said I am right to keep a long password.