The person appears to be a/an White Male, approximately 10 to 19 years old.
Hey dude! 

Hope you're doing awesome! I'm sending you this postcard from sunny [location], and it's epic here! The weather is perfect, and I've been checking out some cool spots. Can't wait to hear what you've been up to! 

Later, I'm hitting the beach, so let's catch up soon! 

Catch you later, 
[Your Name]
Hey buddy! 

Hope you're doing great! I'm sending you this postcard from sunny [location], and I can't tell you how beautiful it is here! I've been soaking up the sun and checking out some cool spots. I really want to know what you've been up to lately—let's catch up soon!

Later, I'm heading to the beach, so I hope we can chat soon! Miss you, man!

Take care, 
[Name]