I was in Vegas a few weeks ago.
If I was going with $500 for 4 days I wouldn't play higher than $5/hand.
If you aren't counting the amount of decks doesn't matter much. Since you know BS for shoes then stick with that. Probably the only place on the strip worth playing is the Trop (Slots of fun is a dump). They have a S17, ds, ls game for $5. If you want to travel a little Stratosphere has $5 tables as well, but the rules aren't as good and it is out of the way.
If you get to the end of the trip and you are winning or even you can then look for $10 tables. MGM Grand has S17, ds, ls, rsa for $10. NYNY and Monte Carlo have the same with H17. This is assuming its not primetime.
Also, if you are doing a lot of traveling/sightseeing on the strip I suggest looking into the monorail. It's $9/day compared to $5 for the duece but it is much faster.
One morning, about 10:30, I just missed the bus (I was on the other side of the street) I had to wait 45 minutes for the next one. Then when that one got there we all ran up to it and it let on about 8 people and it was full. I would have been next to get on and the next bus was right behind it. But it didn't pull up where the first bus was, it stopped twenty yards back putting me at the back of the line. Of course the 60 people who had showed up 15 to 2 minutes prior all got on leaving about 10 people, including me, standing there for another 15-20 minutes waiting for the next bus. Then with the strip trafic it took almost 2 hours to walk from the LV Hilton to the bus stop in front of Circus Circus and ride it to the Monte Carlo. If I would have taken the Monorail I would have been there in 15-20 minutes minus the old lady rubbing her dirty hair on me. For now on, if the monorail can get me close I'm taking it.
To me it's worth an extra $4 for an hour or two of extra vacation.