If you're not on a promotional rate, you can generally expect an upgrade to a Rush Tower room or junior suite from a full-fare Carson Tower room, if available. The Rush Tower is really nice (a big upgrade from the Carson Tower, in my opinion). The junior suite is a slightly larger version of the standard Rush Tower room, so it's not the end of the world if you "only" get a regular Rush Tower upgrade.
The parking garage is easily accessible from the Rush Tower, too, although we used the Rush Tower valet almost every time.
It's $25 for the Landry's card, but you get $25 to spend at partnering restaurants (I highly suggest Grotto at the GN for lunch!), and a bonus $25 in your birthday month, plus the chance at a free room upgrade -- it's easy to pull the trigger on this if you're already planning to stay there.