I went at 30 weeks over July 4th this year with DH and DS (3). I was fine even with the heat but we didn't do alot of the rides (DS wanted to sit on the train for half the day). I found I could walk fine - we took breaks frequently (or were on the train half the day) and drank water all the time.
Only complication I had was gestational diabetes which in hindsight actually made the overall pregnancy easier since I made a conscious effort to watch my diet. Delivered on time with a scheduled c-section at 39 weeks. We flew but originally planned to drive at 34 weeks. Doctor was ok with both trips (she was actually pregnant too and was considering a similar trip). Previous pregnancy had no complications (until the labor).
Only complication I had was gestational diabetes which in hindsight actually made the overall pregnancy easier since I made a conscious effort to watch my diet. Delivered on time with a scheduled c-section at 39 weeks. We flew but originally planned to drive at 34 weeks. Doctor was ok with both trips (she was actually pregnant too and was considering a similar trip). Previous pregnancy had no complications (until the labor).