Everyone...sorry for the late response, but I've been working on the house like a dog.
Thanks so much for all the great advice! I'm going to verify that the pine is not a soft pine, then plan to refinish it. If I'm lucky, I won't even have to sand it (thanks Michael), but we will see. I'm also going to plan to do the porcelain tile in the bathroom, because I'd rather pay more now to maximize durability and the longevity of the rental. As for knocking down the kitchen walls, I think I'm going to hold off until down the road or I'm ready to sell. I'll likely do a full kitchen remodel at that time anyway.
Ronald, I agree that some tenants may not appreciate beautiful hardwood floors, BUT if the wood under your carpet is in good enough condition to be refinished, I would think strongly about doing so. Like Michael said, as long as it's not soft pine, hardwood floors are a very durable option for tenant-proofing if coated in a couple layers of polyurethane. Also, some nice looking rugs can help protect it and still allow the hardwood floor look to impress tenants - possibly increasing the rent potential. Carpeting in my opinion is a cheap short-term solution (in some cases) that will need replaced after just a few years of renting.