It's been a few yrs since I've been there but Indian Mohegan Casino resort is great. Most of my classmates will be staying there for our 25th reunion. Boss, I'm sure you have many others. BTW-it was always called roton-groton.
Thought I would bump this thread because the time is coming soon. I checked out staying at the casino the last time I was there (this spring) because I have heard how nice it was. Not only was it fully booked, but the rooms were extremely expensive (the lowest room price I could find was around 300 a night). I think Mystic is nice to stay in versus Groton or New London. There are lots of places to eat besides the standard chain restaurants of New London and Groton. When booking a hotel in New London or Groton, it may be a good idea to ask how old the hotel is. That is the biggest complaint, that most of the hotels are so old and haven't been renovated in so long that the smell of mold and just plain "old" is uggghh. You don't have to be Navy to stay at the Navy Lodge. Coast Guard cadets are welcome there. You can google the website and give them a call for information. You have to show a military ID within 24 hours of staying there so don't know if it would qualify for R-Day.
I have to agree with kpmom2011 about the Holiday Inn in NL. We had a ship's reunion there last July and the beds were comfortable. We were rarely in the room so it didn't matter if it wasn't a "Trump Property". Like our reunion, I think you'll find out that you will only be in the room to sleep. In addition, I think it's within 15 minutes to the USCGA.