Hi,
How exciting for you to get to go so soon! I have stayed at both the Dolphin and the Swan. The location cannot be beat especially if you can get that govt/teacher rate. One of the impressive things about these hotels is that alhough they are large, their halls are done in such a way that there isn't this interminable walk to your room every day. Dolphin is more convenient to the "fast food" Tubbi's and the pool. For us however, I have decided that I hate double beds for me and my hubby sooo much that we have been staying at the Swan. The Swan has queen beds, and it just makes for a much more comfortable night. This of course is personal preference. We have a king at home and I guess I am just not used to sensing anyone else's presence at night anymore. The 2 have different decors and such but this is the only practical difference I thought I would mention. Regardless, either hotel is just a gem for location and price with that discount.
Have fun!