1: Great suit of
sails, allowing you to use your
engine less
2:
solar,
wind, and/or hydro generation, allowing you to use your
engine less
3:
Watermaker, allowing you to stay away from
marinas and avoid dodgy
water in general
4: Depending on area, but if it's too hot, a
bimini will do wonders to stay out of the heat.
5: Almost more important than the others, but
things that will allow you to enjoy yourself. In my case that is a good stereo, good headphones+mp3 player, ebook reader, and my
laptop (where I sail the most, I can make use of my 3G connection, so I rarely feel the need for a
wifi extender/booster). If you like playing games, obviously something to do that on, if you like playing
instruments, you will want to bring some kind of instrument(s), and so on.