If you have enough time, get the SLR & spend as much time as you can learning how to use it. Take a photo class.
If the trip is next week, you may want to stick with what you've got.
Anyway, spend some time with the camera you'll use. P&S or SRL.
Perhaps you have just to discover how to use high shutter speed.
You must judge your camera by yourself; perhaps you could consider a P&S camera that allows you to go full manual or Av and Tv.
I had an old one with those features and I was happy. I had to purchase a new one just because it was stolen.
