Even if you get an initial location that you don't prefer you can request to be cross-trained in additional attractions in your area after a certain period of time (typically six months). Of course, like everything with Disney, it's not guaranteed, but if you do your best to stand out and do the best job you can, you'll greatly improve your chances. Enjoy Operations! I've enjoyed working in several different lines of business, but I like it the best.
as a former splash/thunder cast, have fun in frontierland, but i do know CBJ/TSI is short. I know a lot of cast don't like tsi at first but they enjoy the freedom of the island and the downtimes for weather. Have fun. I loved my time there