For toys, well some of the best toys for our cats are balls that jingle. The younger cats will play and play with them, chasing them around the kitchen floor. I think right now there's probably about 16 balls in the kitchen and the living room. Mollipop and Tabby really enjoy them. They also like the Turbo "thingy" which is just a circle with a ball in a tube or track that they can bat around in a circle; the center of the tube is simply a circular piece of cardboard that Molli likes to use to sharpen her claws....we have two of those and one that's similar, except it has a mouse instead of a ball.
The girls really like their little mice. They'll carry them around the house in her mouth. You can buy them from local pet stores; we buy from Foster and Smith and they're adorable. There are 48 little mice in a box that's shaped like a wedge of cheese. I buy them about every six months or so. All the cats will play with them, but Molli and Tabby just love them.
Try Da Bird or a similar wand-type toy with a bird or tail that's tied to a string that is then tied to the wand. Our girls love to play with their Da Birds. We also have catnip pillows and the like and all seven of the cats will play with them. We have found that each cat needs his or her own catnip pillow....there is so sharing when it comes to the pillows.
We have a Deli-Dome. It's filled with plastic balls that are filled with dry cat kibble and as the balls roll across the floor, the treats fall out of the holes. We have it set to release a ball about every two hours or so while we're gone. They way they get exercise and they also get to eat treats at the same time.
The cats have their own aquarium. It's not real; it's just a small tank with fake grass, fish and seahorses. When we plug the filter in, everything moves around and they'll watch it for hours. It's probably about two feet tall. They enjoy it.
As for treats, we don't do much in the way of treats anymore. If we do, it's usually Whisker Lickins or something similar. We used to give Pounce, but I believe Pounce was on the list a few years back when the pet food from China had contained melamine. Anyway, we stopped giving Pounce to them.
I hope that helps.