We are DVC Members as well and have gone every each since 2008 (& twice in 2012

We add one thing different each year to make it different. Some things we have done are
Sea World, Discovery Cove (my favorite & woth every penny!), Aquatica, Typhoon Lagoon, Blizzard Beach, Seas Aqua Tours at Epcot, Movie at Downtown Disney, Disney Quest, Mini-Golf, Hoop Dee Doo Review, Stayed at the Nickelodeon Hotel 1 night, Wishes Dessert Party, Ripley's Believe it or Not Museum, Gator Land, Pirate Dinner Show, prob more I can't think of. This year we're doing a few days at Universal then Disney.
I also have to say my boys (13 & 10) are just as happy to mini golf than us spend a ton of money on something expensive.
We also mix it up by doing split stays. We stay about 12 days so it's not so bad to re-pack

They seem to like trying out new hotels. We usually end at AKL b/c it's our favorite. We try to do a Family Meeting before we book to see what their ideas of where to stay & their thoughts on something different. Funny enough, it tends to be the same things every few years.