Dear Mary,
I just visited this great museum here and remembered how you like art. It was a lot of fun and wish you could have come with us. See you soon,
The writer
or
Hi Bart,
Greetings from Croatia, too bad you come with us coz we love it here, it is great! You have to try this food called chevapi, I am thinking of moving here just coz of that. We are going to the beaches tomorrow so expect one more postcard from there. Bye!