I'm going to the Oregon Coast to a 5 bedroom beach house for 4 days. My two kids and their spouses and my granddaughter are meeting us there.
Are they planning on you being the babysitter for the GD? How old is she? Do they live close to you normally or is this a special trip for all of you? Do you have a spouse that is going also? What are your plans with him if he is going? Otherwise I'd take it to avoid being the babysitter, unless that of course is your agreed upon plan.
I am bringing my sewing machine. Is that stupid? I have to stop and pick it up (it had repairs done on it) on the way to the coast, so I want to bring some fabric and maybe sew.
There is a casino nearby
Do you like to gamble and have the funds to do so? Would you be going solo or with family?
and the beach a block away, but I don't think I can go 4 days without sewing.
I really don't have any hand sewing to do.
If you are stopping to pick up your machine and/or buy fabric, you could grab some small hand project to tuck into your bag.
I just don't know if I should bring my fabric and machine in the house. I thought if everyone went shopping or something, I could sew.
Again, to me it depends on how often you get to see them...if it's all the time, then use the time as you wish, if this is a rare occasion, I can't imagine wanting to sew more than visiting with my kids, even if they are talking to each other and not me, I have learned so much about them and the things they did in the past, it was a hoot.
What do you think? It's my vacation.
Yes it's your vacation -- plan accordingly, but I would mention it to your kids so they don't get their feelings hurt when you ignore them in order to sew. Of course this is just my opinion 
.
Hope you have a wonderful vacation whatever you decide to do.