I had the same fear about travelling that far so close to my due date (although I did up until 2 days before my due date because I didn't really have a choice) and although you're fairly safe its really not pleasant travelling over an hour in the car when your 38+ weeks pregnant! And would be even worse in this heat...

i agree with Dach, go out to lunch and enjoy eating without holding a baby! Or go to the beach. Or somewhere with a pool!