Bachelorette party at 34 weeks pregnant?

A good friend of mine is getting married and has just invited me to her bachelorette party, thing is I will 34 weeks pregnant, it is over 2 hours away and will be overnight and they plan on going to the bars, so needless to say I am not personally stoked on going, on the other hand she is a really good friend (my daughter is her flower girl and my boyfriend is grooms man in the wedding) I know if I try and explain I am pregnant and don't really want to go to the bars or be 2 hours away she will tell me it is a lame excuse, but seriously, I do not find it an appropriate situation for myself and will feel uncomfortable (plus I can not stay up until 2 am, not only being pregnant but having a toddler to watch when I get home lol) I am wondering what I can say that won't sound like a lame excuse not to go (Just saying I am pregnant she will try and twist my arm to go anyways saying it isn't an excuse not to go) Thanks for any answers/ideas