You both will enjoy the unique Cozumel drift diving.Like riding on an escalator !Safe lots of air and energy!You need reasonably good buoyancy for the swim throughs,and avoiding messing up the corals...and yourself!.I like most divers use a 3mm full suit all year round in Coz..I never have a need for a hood.Gloves and knives not allow.Most people don't use hood but you may want to bring one just in case you need one.We all have different tolerance for water temperature.Bring lights,mirror,whistle ,underwater signal device(eg,tank banger),EMS scissors,& SMB .Practice deploying your SMB!Have a good check out dive either at the pool or shore prior to your first boat dive.Don't be shy about letting the DM know your skill levels.Stay close to your buddy.Avoid task loading like using camera for at least a few dives till you are comfortable.You both may want to do some shallow dives at Paradise or Columbia,before venturing out to the deeper sites.Cozumel is a great place for newbies......underwater and above....