Some folks set up their laptop inside a portable hunting blind and love it, although it can get a little hot inside. A battery powered fan can help, and/or making sure you leave the doors open a little, plus open its windows a little to get some cross ventilation.
Here is one that you can search for on Amazon or elsewhere... Rhino Blinds R75-RTE 2 Person Hunting Ground Blind.
There is also a one-person blind with a built-in seat, but that would cause me to become claustrophobic in a few minutes. You can check Cabelas or any good sporting goods store for any of these blinds. The ones like the Rhino mentioned above are, to me, better in that the shape of the doorway is more accommodating than the ones with an X frame on the walls. I don't bend as good as I used to, and will get a Rhino like this one in the near future.