Results: Do I get a hotel room, or just stay with his family?

So my boyfriend's mother invited me to their family reunion (note... I haven't met any of his family, including his parents). They said I could stay with his cousins while I visit (it's a 4 day reunion). I can be an introvert, very shy, and do have anxiety... I have been tempted to get a hotel room, just so I have a space to relax and recharge in, but at the same time, I don't want to disappoint or offend them in any way. I would also like to make a good impression, as I do like my boyfriend!