Peter Schiff had this discussion with Robert Wenzel (of EconomicPolicyJournal.com) a while back. We basically had a thread on it starting here.
Wenzel eventually ended up endorsing a capitation tax like you suggest, but as Schiff brought up, it would have to be apportioned according the the Constitution, or the Constitution would have to be amended.
I don’t think anyone who understood anything about economics would endorse any sort of tariff. Virtually every modern economist (even mainstream…certainly neoclassical) admits tariffs are the wrong way to go. As usual, Friedman drives this home with incredible articulateness.
As for leasing of federal land, I think this is already largely done to the extent that the market would bear it. (I could be way off on this, but it’s an uneducated guess just based on my limited knowledge of federal lands and what the market interest in them is.) I think it would be much more advantageous (and probably feasible) to auction most of it off.