I was sick for the whole nine months of both my pregnancies and during the first one had a holiday in Orlando when I was about 6 months.
By that time being sick was so routine the best way to cope was just be sick and get on with iwhat ever I was doing. Nothing I ate or drank helped but it is worth trying everything. You never know! Best thing is to find out where all the bathrooms are when you get into the park and carry a plastic bag (or an airplane sick bag) with you in case of emergencies.
Congratulations and good luck