Should I pay for my husband's family vacation?

Ok so we were talking about going to the beach with his family. I looked up activities to do there in case the in-laws want to do anything else besides what they do every year there ( chill at the beach, go to the mall, chill at the hotel). It'll be me this time along with my husband his mom, step dad, his younger brothers (17,15) and sister (19). I never been so I'm excited. I pitched in some money for the stay. So I brought up activities to my husband and he said "we should pay for them to do things too because they already paid for the hotel". I'm like what, we pitched in too for the hotel, I don't think it's fair to pay everyone's way for different activities when the parents make enough to pay their way too.

Should I pay for my husband's family vacation?
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