I really don't want to help pay for a hotel room
Why don't you want to help pay for a hotel room?
I would like to keep the money for myself and do some other fun things with them.
Your money is supposed to make ends meet but have fun too. But it is not right to not share in the responsibility of paying for a hotel room if you are going with friends or family. Pay your share, otherwise they will talk about you behind your back.
They want the money for each person, so I don't care about paying for stuff.
If that means you're going to pay for the room now, then I'm glad. It's always important to pay what you owe in any situation.