I have a severe allergy to nuts. However, I am supposed to stay in a lodge that is located on a macadamia nut farm. Would this be a hazard?

Yes. Macadamia nuts are considered a tree nut and avoidance is key in managing your allergy.
Nut allergy. The answer is an emphatic "yes." the big problem with nut allergies are that individuals often have severe reactions even to the most minute quanties of exposure. This is a hazard i would avoid, if possible. Otherwise, make sure your doctor provides you with an epi-pen, which i suspect you would already have, if you have severe nut allergy.