Mid-Mountain Marathon in retrospect

Looking back on my personal worst marathon, I think I would do the following things differently next time:

Train much, much, much more on trails.
Get new shoes (mine have 550+ miles on them).
Train more on trails.
Do more long runs (duh! What was I thinking max-ing out at 17?!?!)
Lose the ample jiggly area around my mid-section. Seriously, how long have I been carrying this around?
Train much more on trails!

Why am I blathering on about this? It's all stuff that I know and should be doing something about...