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