I went twice when pregnant...once at two months along and I took afternoon breaks to rest. The other time I was 5 months along, drank a ton of water, and due to the humidity, my fingers, ankles and feet swelled up to the point it was hard to move them. The last day we rented a wheelchair just so I could get around easier. I still had a great time and would do it again. I just took it easy and rested a lot more.
Then there was the time on our honeymoon where I had a fanny pack and switched it over to my tummy so I could sit down easier. As it turns out, the bus was so crowded, I had to stand. Then I had a very kind man pretty much INSIST that I take his seat, so I ended up sitting. While walking back to the room my husband and I were commenting on how kind that gentleman was and how he was so insistent on having me sit. It was then that we realized the fanny pack was still over my tummy, under my sweatshirt, so it looked like I was pregnant. We found out nine months later that I really WAS pregnant.