Which of these packs add the most gameplay?

I went ahead and bought Fitness and Backyard stuff yesterday and I'm having a lot of fun with both. I have this 64x64 water park in Windenburg and took full advantage of the water slides, lol. I never really take my sims to pools during the summer because... there's not much you can do in a pool. It's neat having more options. As for Fitness, none of my sims have earbuds yet, but I also haven't seen any random sims walking around with them, which I really appreciate. No idea if that will change once I manually give some of my sims earbuds, but I'm still having fun with the pack either way. It's been surprisingly entertaining watching my sims struggle up the climbing thing.

Anyway, I really appreciate the suggestions, guys. I'm terribly indecisive about these things and I easily get buyers remorse if I buy something and it... wasn't worth it. Honestly, I'm probably going to start buying stuff packs in the future based on this poll, lol. So, next time I'll buy the toddler pack. :)