You can play memory with your cards (the "matching game") where you lay them face down on the table and flip over two at a time to find matches. Or you can play Go Gorilla (Go Fish)! Make sure you are modeling the good /g/ sounds in every word, and make your children say them with their good /g/ sound.
Thanks to my favorite co-SLP Colie for making these amazing pictures! You can find other great speech activities on her speech blog.