About David...
I'm fine with any postcards I received.
Since I'm a curious person, and I love travelling, you can explain to me about the content of the postcard you chose, and also include me a place that you feel is worth visiting. (Hopefully the place is off the beaten track).
I also love books, so you can write some book recommendations to me.
If you don't like to send travelling related content in postcard, perhaps you can write about a dream that you wish you achieve. If you don't like any of these topics, then just send me any messages you like. Thank you.
Btw, I love stamps too. I will be very happy if you want to send postcards with envelope. Maybe you can add small souvenirs inside if it's an envelope, because I like souvenirs. It's just a suggestion anyway. Anything is fine for me.
Feel free to write in Mandarin if you know Mandarin.
And finally, if you want to have a pen pal, feel free to message me, we can send letters or postcards.