We went on a whale watching cruise with Davey Jones Landing. They have great specials on Groupon. We saw perhaps 5,000 sea birds in huge groups feasting on small fish, plus perhaps 1000 dolphins feeding on the same small fish. Even though we didn't see any whales it was still quite enjoyable.
I would think that if you went to the shopping center, Fashion Island, that you'd see some pretty lighting displays.
For activities, if there aren't enough on-site, consider going to Disneyland, the La Brea tar pits, Universal studios, etc. Also, going to Catalina can be fun. Consider staying overnight. I think that you'll find that the week goes quickly.
BTW, I was there last week. The weather was cool (60's and lower 70's, except for one day of rain). DW brought a DVD movie. No problem with the weather.