Yes, Brian is right. I meant to say the valve cover gasket.
Overall, I think it really depends on whether you have done the "regular" maintenance or not. If not, then what Brian said is accurate: do the transfer case fluid which you can easily do, and the spark plugs. An oil change, obviously that's a straight fwd maintenance.
If you want to do an extensive preventive maintenance then the third list is consistent with what I said.