Your first problem is this:
<p>
<div id="subtop">Beer, Music and Brewing are just a few of my Favorite Things</div>
</p>
You cannot have a DIV inside of a P tag. DIV is a block level tag, P can only contain inline elements. Change your code, wherever this is (probably header.php of your theme), into this:
<p id="subtop">Beer, Music and Brewing are just a few of my Favorite Things</p>
Something else is producing an error in your code:
<div class="entries"> <font color=red>Error: Photos path must have write permission for reduce originals option!</font><br>
The problem here is actually that the error produces invalid xhtml (red must be in quotes). But you might be better off solving that actual problem, which is visible on your page.
Several of the remaining errors have to do with the Amazon code you used. Amazon frequently creates this invalid code if you use their online link generators. I would avoid those and use wp-amazon or something else instead.
Also, your theme itself appears to have a problem with the widget configuration. It’s using a UL for the sidebar, but then putting DIVs inside it, which makes no sense. Your sidebar.php and/or the functions.php needs to be re-examined and re-written.
The rest of the errors are pretty obvious. Work them one at a time, from the top down. Revalidate after *each* error is corrected.