Welcome to LCT Bill! I've been on the PG twice but at different times of the year than your trip. As you have most likely learned their seasons are the reverse of ours so you will be there at the beginning of their summer. Expect fairly hot and humid weather outdoors with a good chance of some rain - but at least it is warm rain and rarely lasts all day.
We have no interest in the casino so my only knowledge is that it is a small one (made even smaller this past January).
Our anniversary is January 2 and we've been on the PG in late August/early September and June but gone to the anniversary party both times. They did it at Bora Bora where the sunsets are beautiful.
It's good that you have the 2 nights booked on land prior to embarkation. If there are any problems with your flight connections you'll (at the worst) still have 1 night in a hotel in Tahiti before the beginning of your cruise.
If you go to the Off Topic section of this bulletin board you will find the first thread titled "How to post a picture refresher course" By Karen S. With a little extra help from Karen even I was able to post some pictures! She will take care of the sizing of the avatar photo for you if you send her a photo to work with.