As stated you can't eat in Blu, only for AQ patrons and suite patrons for a fee on an as available basis. They are very strict about it.
I enjoyed the Aqua Spa pool. I am a Melanoma patients and do not choose to be in the sun. I just sat there for days with my Kindle and Ipod and enjoyed myself.
As someone else stated, try the specialty restaurants, they are really excellent. MDR is fine but Tuscan and Murano are fabulous.
Wife and I also took a bunch of IPOD courses which were free. Simple stuff but then we are just that, simple.
I avoid Celebrity's casinos as I believe their odds are set so low as to not be competitive. Have been in casinos all over the country but theirs just don't cut it.