Well, I'm going on my second cruise in little over 20 hours and can't wait! You'll probably want to pack an iron, as many ships don't seem to have them. (I guess because of the fire hazzard) Also, the formal nights are Tuxedo events, so pack accordingaly.
Also, I have some friends that are serious cruisers (multiple times per-year, very annoying!) and they loved the Splendour of the Seas, so I'd feel comfortable in your decision!
I really hope you have a great time, and that you cruise in the future again!