Well, I will give you my opinion.
MOST of the cabins do not get decorated. Some do, of course. Most campers DRIVE in so they can bring their decorations with them. Cabin folks drive AND fly in though not many decorate. <although if you read past threads some cabin folks come prepared>.
Cabins have a deck with a double outside plug that is good for lights or a small tree. Inside in a window is a possibility with festive lights or decore. If you are driving in I say, bring another trailer full of decorations. When you drive back from a park at night or walk back from the bus stop, there are few cabins decorated so yours should stand out.
I expect a Clark-Griswald-Family-Vacation-Christmas effort from you.
No pressure though.
Bama ED