I went on my first Spirit cruise on the fourth of July, it was a dinner cruise and i absolutley loved it.  We got there early and were able to board early and ate the buffet right away before the lines got long.  the food was fabulous and and we had the package that came with an open bar, (very worth it, if your big drinkers)  otherwise drinks are quite expensive on there.  The staff was great, very friendly and entertaining.  the fireworks show was amazing and we had a blast dancing and listening to the DJ and seeing the views on the outside deck.  plus you could smoke outside which was a plus to me.  The entire inside of the ship is smokefree.

 My second cruise was a lunch cruise on a friday afternoon.  Seemed quite a bit shorter than the dinner one but still fun.  The staff performed songs and they did some fun line dances.  The weather that day was raining and cold so we didn't venture onto the outside deck.  still fun, but would highly reccommend the dinner cruise.  im going to try the midnight cruise next.