Record A BUNCH of B Roll you never know when you are gonna need it. Talk about the things you are going to do, strange things that happened during the trip, and get others involved with your vlog. As far as formatting goes, it depends on your own style, Vloggers sometimes just talk about what they are going to do then do it, some are organized and plan out the whole day, and some meet some where in the middle and include both planned and spontaneous events.