Sunshine Rewards is awesome! I have been a member since early 2006 and have just topped $4,000 in earnings. Unfortunately, it took me a year or so to get really serious on there, but I'm very addicted now!
The bulk of my earnings are from daily surveys. There are currently 6 daily surveys that can be taken to earn up to $4/ day which really adds up! Qualifying will depend on your demographics as well as persistence, but there is the potential to make $120 a month in just surveys!
The other way to earn on Sunshine Rewards is online shopping. There is a large list of merchants that you can shop through SR and it grows on a weekly basis. They often post coupons and increased cash back % for various merchants throughout the months. I typically am able to find a better deal on things and I don't have to drive anywhere.
If you join Sunshine Rewards, be sure to pop over and join their forums. There is a lot of information there and tons of people willing to help you earn! I have been there since pretty much the beginning and their customer service is top notch! I think the most popular cashouts are for Disney Gift cards and Paypal although there are a lot of other options as well.
On our last trip in May, I took enough in gift cards to pay for 2 annual passes and all of our food. Since probably April, I have earned another $550 that will go towards our October trip!!!