30 amp service
Yes, you absolutely can. You will need a 50 amp female to 30 amp male adapter. You will be able to run one air conditioner and lights. Other appliances you may have to be careful, but your circuit breakers will let you know if you try to draw to much, especially with heating elements, such as hair dryers, electric hot plates and such. But really, probably won't have much problem. Have done it many times.