My tracking indicates our international treks seem to come in around $3,000 a week, even when I think we're being frugal (ha!). These are real numbers from a recent two week trip to Florida (gateway city), then Peru, two people:
RT airfare between LA and Miami: $608
Four nights hotels in Florida: $525
Car rentals & gas: $275
Florida activities and meals: $500
Peru 10 day tour, including RT airfare between Miami and Lima: $4,073
Peru spending cash & tips: $580
Shuttle to/from airport: $170
Total: $6,797
By comparison, our RV trips run just $700 a week, or $100 a day. That amount covers our RV site, generally a full service RV park, groceries, gas, and activities. Since the majority of our days are spent hiking at zero cost, we are able to enjoy splurge activities as we have time and energy. Recent trips included guided rafting and kayaking trips, a llama trek, live theater and concert tickets, museums galore, and lots of food, beer and wine tasting.