First of all, I very much appreciate the input and suggestions!
Well, I do not WANT to have separate sites if I do not have to.
But I need to have separate pull down menus for each of the "sites".
If you would like, please take a look at this site.
I created it in raw html, as I did not know about style sheets and all that stuff.
It is going to be reconstructed as onemanz.com/guitar. Reviews, articles and interviews with extensive video and audio files of guitars.
Note how the menu item under Reviews/Acoustic Guitars leads to a page where I intended to have reviews listed for many different brands of guitars, which each individual review under a menu, like C.F. Martin.
The other sites, like onemanz.com/malt - reviews of malt whiskies - do not have nearly as much multimedia involved, will be simpler overall, but still need their own unique menus for reviews, articles, media, gallery.
The home page, onemanz.com will have a four column table with the latest posts for each of those four subsites, or whatever they should called. So that home page operates like a current events blog, the subsites are subject specific but themselves will have subpages.
If I CAN accomplish this with one theme, customizing the child pages or secondary pages, etc. for separate menus that will be fine. If they must all have the same background and banner, I can live with that.
It is the pulldown menus for each that matter most, and hopefully the ability to keep each category (guitar, malt, beer, meal) with its own archive.