Well rested: a good night’s sleep before your trip is crucial as insufficient sleep can contribute to and make you more susceptible to factors that can cause seasickness.
Take medicine like Dramamine or other ant-nausea medications. Or, for a more natural route, a capsule of ginger powder or peppermint oil is great, some say even better than the man-made medications.
Try the seasickness bands.
Get lots of fresh air blowing on your face