You must not be dealing with typical tech investors if they're asking for those sorts of things. Tech investors generally don't ask precisely because they are meaningless.
The best you can do is look at your nearest competitor. Pro forma numbers work great for the guy who ran one hotel and is opening another down the road. They can justify using the same occupancy rate, etc.
Using your competitor's historic traffic data is, of course, meaningless, but to someone who is asking you for numbers that are by definiton meaningless guesses, it probably counts as justification.
The best you can do is look at your nearest competitor. Pro forma numbers work great for the guy who ran one hotel and is opening another down the road. They can justify using the same occupancy rate, etc.
Using your competitor's historic traffic data is, of course, meaningless, but to someone who is asking you for numbers that are by definiton meaningless guesses, it probably counts as justification.