I took my wife last May-June when she was around 30 weeks I think. Got lots of tips from her ob/gyn who loves Disney World and told us all about how his wife dealt with it while pregnant and when nursing. Look into the baby care centers ahead of time, stay hydrated, keep your feet elevated whenever possible, get comfy shoes, etc. The only hitch we had was she got a cold around the 4th or 5th day. The dr tried prescribing her something but we always used a pharmacy at a store they don't have in Florida so we had to just settle for OTC medicines. She ended up staying in bed one day and the last day was a little rough for her but only a half day. She actually credits the trip for helping her to actually weigh less after giving birth than she was before getting pregnant! Just talk with your ob/gyn beforehand. As others have said, early in the third trimester is one of the best times to go when pregnant.