Get a Hubsan X4 H107D and fly it in the house, buzz your pets, your kids, your wife (though they tend to become EX-wives if you do that too much) and pretty much anything else you care to buzz, knowing it's cheap to fix if you do break it, and it's always fun to drive your kids mad
For the P3 as everyone else has said, learn a new skill. Get some photo editing software, some genuinely good editing software, join a photography forum, and then stretch your photography skills, learning all the way. My shots now are so far ahead of what they were when I first started flying my P2, and I've learned so much, it drives me to try new things and new places. Even if you're not in Australia, the ausphotography forum are fantastic to learn from, they will bring your skill levels up no matter how high they already are, and you'll see things that will inspire you to try more with the camera - especially given that you can get angles most photographers can only dream of.
These aircraft aren't really an exciting thing to play with, they're not a thrill a minute, and they weren't really made to be that, they're a photography platform and that's about it, so stretch your photography skills with it. That's when you'll be using it the way it's designed, and so continue to be inspired by it. Go new places, try new angles, as you go through your day, look at everything around you and think how you'd place the bird to get the best shot of it.
Where I am, a nearby building site has two massive identical tower cranes on it at the moment, and they light them up at night, especially as two of them together is a little more rare, they'd make an amazing photos (if it was legal to fly at night

) It's almost enough to tempt me to break the rules, but there are plenty of legal things just as interesting to shoot if you look for them.
I agree also with the suggestion to travel with it. You don't even have to go far. Most places have something different and interesting within an hour's drive or so of them. Make a day trip of it, include something your wife will love, whether that's a classy restaurant, or whatever she loves, and include something that the kids will find new and interesting for them, and they'll probably even tolerate you spending an hour or so with your bird.
Then if all that fails, soup up the specs and go out to break your records - longest flight time after stripping down the weight the most you can, or longest range flight after souping up the vtx and antennae etc,
And one final idea, go join a model aircraft club. Some of them are welcoming of quad owners. Nothing makes something more fun than doing it with like-minded people. They might even like the idea of a stable fixed position filming platform to get new interesting shots of their aircraft, and shooting a moving fixed wing model has to be a bit of a challenge for any quad pilot. That could add to the challenge level, though I'm not sure if they'd allow two craft in the air simultaneously, but you could possibly sell them on the idea if they saw the footage potential you could give them.
Mind you, having said all this, I pretty much need to preach to myself as well. Lately I've been so tired after work that I crash in the lounge instead of taking the P2 out to crash. And weekends there's just too much to do at home. But then it has been winter here for 3 months, so it's dark before I get home, and it's below freezing after the sun goes down, so both of those do test the resolve a little. I'm sure now Spring has just arrived I'll get a bit more enthusiastic again.