Look here for online materials interesting to school age children.
For starters we offer this game motivated by our River Rangers program.
This is our first attempt at an online game. It is under development, so don't expect too much too soon. The idea is this: Can we give an “adventure” style of game that introduces kids to the Navesink River. Its target audience is those who are signed up for River Rangers. By playing the game they simulate travelling around the Navesink in a canoe. So when they actually do the River Rangers program, they will recognize sites as they approach them.
The second idea is we can use the game to reinforce certain water safety issues. Wear life jackets. Proper shoes are required. Stay together in the group. That sort of thing.
This is (was) the link that will let you run the program if it is available at this stage of development: