Even though she was only 17 years old, this woman was already an expert on koi and other tropical fish . It's fortuitous that she got a job to match, starting off at a retail tropical fish store. Whether you have a pet or not, spending time at pet stores is a fun and free activity to do. Many stores have tons of cats and dogs, some have gerbils or birds, and others have aisles and aisles of fish tanks. As far as retail jobs go, I imagine this is a pretty calm place to work most of the time.