i love my guinea pigs but it just doesnt seem like theyre as happy as they can be: (
I tend to spend time with my guinea pigs just cuddling with them. I also give them out of cage play time every day as well for several hours. They just love to run around and explore. You can also give them chew toys as well. Mine like to chew on paper towel rolls, kleenex boxs, ect. Some also like those cat jingle balls to play with. STAY AWAY from those balls and exercise wheels though as guinea pigs are not made to play with those. Do you give them plenty of timothy hay? All of my guinea pigs just love eating and playing with that as well.
try spending as much time as you can with them, take them out and play with them everyday if you can. you could also give them treats (like carrots, my guinea pig loves carrots)