The plan is $4000.00 per person sharing.  This includes airfare, ground transportation, lodging, park entry fees, and most meals. It doesn't include cost of visa, exit taxes, tips or drinks. You are on your own with shopping.

If you do not want to share lodging, that will cost roughly $500.00 more.

The real wild card here is airfare. It is about half of the cost. I can play around with the land portion of the trip to keep it close to $2000.00 a person, but if airfare climbs over $2000, I will then have to do some real re-thinking on the itinerary. But it will work out, it always does.