What do you think you need to wear? I'll wear shorts and a t-shirt, when I'm not stripped to a bathing suit. You have the ride there and free (ok not very luxurious) accomodations. Accomodating your kids is slightly more tricky, but if you can bring a tent (or get someone else to) then they can come as well.
The only sticker is being on call. We've already offered to make sure that you have a computer with Access available. However there is a legitimate concern that you might not be in good condition if there is a disaster.
Either way it is your call, but most of your excuses are non-issues.
Cheers,
Ben