Have your doctor do a quick once over to ensure everything is a okay!
While some visa applications require you to have travel insurance, if you are going to a visa free place, still get some kind of insurance for yourself.
If there are certain medications you need to take then you should take them along. Have your own mini first aid kit which includes bandages, plasters, pain relievers etc.
Lastly remember, the fact that something is over the counter in your country does not make it same all over.
Check out what precautions are necessary for where you are going and also what to avoid.
I am pretty adventurous when it comes to food but always be cautious, especially if you have allergies. Most restaurants will tell you what's in the food so that's fine but be careful about eating at just any place or even fruits etc. And be extra careful when it comes to water!
Exercise a little but don't over exert yourself.
If you are in a cold place, stay warm. If it is warm, ensure your clothing is loose. It might seem basic but it is easy to forget. Shawls and jackets are a girl's best friend!
(Even here please. Lol)
- See a doctor!
Do another post trip check up
Rest for an extra day if you can before going back to work / school to avoid breaking down!