Last night, while I was sleeping, I had an amazing dream that I went on a trip to your country. When I woke up, I felt so happy and excited to have visited your country.
A couple additional tips:
1) You don't need to tell me you were sleeping when you had the dream. As soon as you I say "last night," I understand. Dreaming while awake (imagining something) is called a 'daydream'
2) We don't "see" dreams. We "have" them.
3) The past tense of "wake up" is "woke up." You could also say "when I awoke."
4) I was a little confused what you meant by "I got a nice trip." If you won the trip from a contest or somebody gave it to you as a present, this makes a little more sense. I think you just meant that you went on a trip.