It's a Ritz, not a palace. Common courtesy and respect are of course desirable. Particularly in the hospitality industry, where employees often have to deal with unreasonable or obstinate requests, a little kindness can go a long way.

Otherwise, jeans are more than fine. That particular hotel during the summer gets a lot of families, and you won't be out of place in casual clothing. Regarding the bar, we all have different standards for what we consider acceptable, but it suffices to say as long as a man has a collared shirt on, he's within the parameters of "smart casual."

You'll also get a number of opinions on tipping, but a few dollars to a driver depending on ease and length of the trip is a nice gesture. I don't usually tip concierges as they're decently well-paid and don't expect tips for normal requests (non-monetary gifts are also generally more appreciated), but $20 to a concierge if he/she helps you with a number of things over a multi-day stay seems fine.