Since you've been doing construction for a while, do you think you could manage your own company? That's obviously the best way to live the lifestyle you want if you think you have the skills to manage your own construction company. I'd just go for it man. Get a business plan and just borrow the money you need to get started. I know it wouldn't be easy but its just a suggestion.
If you wanna go back to school for a while I'd recommend accounting, because then you could either do accounting for a construction company possibly, or if not and you want to have your own business you can do your own accounting. There is a really big need for accountants right now and if you have a degree you could make 35k as a bare minimum.
Working for the postal service is pretty good money, look at this list
http://www.resumagic.com/hpj_nodegree.html
If I was in your situation and wanted to just start over I might also consider going to alaska as a fisherman. They can make 100k a year or more without any education at all. It's dangerous but you can live tight up there for a year or 2 and save your money and have what it takes to get a fresh start or go to school or just whatever you need really.