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excited: I'm planning to go to Costa Rica next month! It will be my first time, I can't wait!
gpt
I'm travelling to Costa Rica next month for the first time. It's going to be awesome! 
gpt
That sounds very exciting. I am sure you will have a great time.
gpt
Yes, I can't wait. We're planning on doing some diving and hiking. 
gpt
Those sound like fun activities. I hope you take lots of pictures so you can remember the trip.