I'm going to assume that your Winnie is similar to ours, and doesn't have a transfer switch. You have the choice of plugging your shore cable either into a shore connection at a CG, or you can plug it into the generator outlet in the cable compartment.
The fact that you have power to the microwave, but not the other outlets, makes it sound as if the problem is either a breaker, or maybe the GFI outlet in the bathroom. They may have wired the microwave outlet separately from the other circuits because of the load.
Do you have power to the outlets when you are plugged into shore power?
Does the A/C work?
I'd check the GFI in the bathroom, and see if it's tripped.
Then, you may want to figure out why it tripped??? But sometimes, they just wear down, and trip a bit too easily....and should be replaced.
Keep in mind, Winnebago, like most places, is looking to save money, so they buy the least expensive parts they can, and your GFI outlet may be one of those cost cutters.:(
Good Luck:)