Shedd Aquarium in Chicago has a great collection of interactive learning activities. The activities are categorized according to grade level and vary in format. Some of the interactive activities are like video games (Squish the Fish for 1st graders) while others are more like virtual scavenger hunts (Conservation Investigation). The games and virtual scavenger hunts could easily take students an hour or longer to complete and the students would learn something new throughout the activity. In addition to the interactive activities, Shedd Aquarium provides a host of great Marine Science lesson plans for grades K-12.