The generator will shut down if you try to pull to much from it. With no AC you should be able to run lights, pump, bath fan, radio/tv. Electric water heater or microwave might be able to run, but only if they're the only items running. Small appliances like toasters, toaster oven, coffee makers are ok but watch your total wattage.
Forget the AC of course.
Here's a nice wattage chart Champion has put together: