Be sure that you have prepared a light luggage. First plan what you are going to take and cut it to half:)
Prepare wisely. Roll your tshirt and dresses instead of folding them.
Take a scarf, so that you can use as a scarf :) ; as a throw when having a picnic or as a jacket (check youtube for tutorials:) ).
Women only; if you are going to have high heels, use thick heels.
And for tooth brush and paste; you can always ask your hotel reception.
Lastly for summer, use a fly-repellent.
Enjoy your holiday!
Photo credit: Simay Yılmaz