A lot of stores sell fresh steamable produce in bags, like broccoli that is already cut and you just put the bag in the microwave for 3-4 min.
I don't know if you do dairy, but my go to cook-in-hotel-room meal used to be cottage cheese on top of a baked sweet potato with a big side of steamed broccoli or other veggie, topped with butter or coconut oil.
To cook any potato in the microwave, wash, stab a few times with something sharp, microwave for 5-7 min small potato, 6-8 medium/large potato.
Also, the flavored tuna right out of the pack is delicious, but read the label. I almost bought the spicy thai flavor and then noticed it had soy and wheat!! wtf!