We don't fly, because it's too damn expensive. We drive, so we save on that, plus the car rental. We normally go somewhere with a beach & stay where we can cook our own food for some of the time. So, we can get by on 1k or so.
Well, where are you thinking of going? What type of rental car would you get? Car, SUV, minivan? You didn't mention hotel in your post, so you'd have to add that in. Are you luxury people, or will a cheap hotel be ok for you? Food costs depend on where & how you eat - are you eating out the whole time, or staying where you can cook? Fast food, sit down, 5 star dining? What would you be doing for entertainment/outings?
I don't think I can answer any of your questions without more info, honestly. There are too many variables. What is your budget? Because what is reasonable to M. may not be what's reasonable to you - I am a cheapskate & like to save wherever I can. If I were to spend 5k on a vacation, I'd better be going somewhere tropical!! I think you'd be better off adding more details, or searching for prices online.