I think it's a good idea to have two e-mail accounts with one that is personal and private, limited to family and friends and the other for business purpose only. Both can be recovery e-mails if you ever had problems signing in. I don't trust businesses as they always sell their e-mail lists to other businesses which will send you unsolicited advertisements, mostly spams.
It's only an hour flight, Cuban visa can be bought during check-in at the airline counter before departure, just don't forget your passport. I exchanged dollars into their convertible (CUC) pesos upon arrival. I stayed at an hostel next to the baseball stadium. I focused on videotaping their culture alone rather than being somewhat biased traveling group with their hectic schedule. One day took a Soviet era Lada taxi to outskirts of Havana to visit a Deaf school. They asked me what we Deaf Americans do with our obsolete TTY as we are using VP nowadays, hopefully some organizations will donate those equipment. I felt like was blasted into the past, surrounded by all those vintage automobiles.