What Would YOU Do With A 55 Gallon Drum Full Of CASH!

First I wouldn't tell anyone and pretend nothing changed. Start an LLC and hopefully one day employee a bunch of people.
I would pretend someone else owned the LLC and I worked for them.

I wouldn't want any of my family or friends to know.

I was with you until "free Jesse" WTF?!?! The little shit tried to burn his house down and then turned him in. And now that Jesse knows Walt left Jane to die, he's even more pissed at him.

If I were Walt, I would have done precisely what he did, at first. I would have pushed that barrel to the nearest Indian shack and bought a run down old pick up with $10K in cash. But that's where I diverge with the show. Going home was stupid on so many levels, not the least of which is that there could be nothing there Walt had to have. No item of clothing or knicknack or anything there would be worth showing up if somehow the DEA had gotten wind that Hank and Gomez went missing looking for Walt. Then I would have dropped by Saul's office, gotten him to give me one of his burner phones, called my wife to see where she and the kids were. At that point, he would have found out that she believed he had been arrested. I would have told her that I escaped from the jail, that I had $11M in cash and it was time to disappear in 30 seconds flat, a la Robert De Niro in Heat. I would have told her to meet me at one of those motels where you can park right in front of your room. I would have then gone to this motel and rented TWO rooms, with each room being on the opposite side of the hotel from one another such that could not see one from from the front door of the other. In one room I would have left a note for her to call the burner cell phone. That is the room I would tell her to go to. I would tape the key to the door so she could get in. Meanwhile, I would be parked in front of the other room with my barrel of cash in the room. Once she called, I would look discreetly out the window of my room to make sure no cops were visible from my vantage point, then I would carefully make my way outside looking for cops the whole way, until I got around the other side of the motel and there were still no cops visible when I could see her room, I would call her back and tell her to come outside and meet me. This way, if there were cops in the room with her, they might get me, but they wouldn't get the cash. I would have given the front desk clerk a $10K stack to promise not to tell anyone I had rented two rooms. If need be, I could use my one phone call from jail to tell Saul to get my cash from the room and use a million or so of it to hire me one of the top "Tall Building" criminal defense lawyers. Assuming she didn't bring cops, I would get her and the kids to come over to the other room with the drum of cash in it. When Junior asked me about the drug dealing I would explain how Uncle Hank had forced me into it (just like on the home video I had made) and that Hank was going to see me sent to prison for Hank's crimes if we didn't get out of Dodge right away. I would take a few stacks of cash and take junior with me to trade in the beat up truck on a large SUV like a Suburban, preferably with tinted windows and NO ONSTAR, which I would pay cash for. I would then go to a Department store and buy several large pieces of luggage, and head back to the motel, where I would get the wife and junior to help load the cash from the barrel into the luggage, explaining to Junior that this was just one of many such drums of cash that Uncle Hank was stashing from his lucrative meth business and when he brings up his Aunt's story, I would explain that she was trying to turn him against me because she knew the heat might be coming to Uncle Hank, and that she had threatened his mother with prosecution along with me if she didn't back her story. We would load up the Suburban with the luggage and the wife and kids and drive NORTH (i.e. not south to Mexico as many might assume or guess, as far as possible before needing to stop, this time at a nicer hotel with interior-access rooms and those luggage carts you can get to haul your shit to your room, probably a Holiday Inn Express or something, where I would pay with cash and claim to have lost my drivers license if asked, but I would use an assumed name. We would haul our "luggage" into the room, where I would leave the wife and baby, while Junior and I went out to buy everyone some new clothing and other sundries. After that, I would try and find a furnished cabin in the Rocky Mountains where I could pay with cash for about a 3 month stay, and hole up to figure out the next move.