If you have access to science museums and a flexible schedule, then the home-schooling component might just be time absorbing everything and all of the discussions at the science museums. All of the Smithsonians are free. Use all of the science channels. Check the on-demand programs and science news. Visit different libraries / special collections like the ones at universities. Use computers for information. National Public Radio has science Fridays.
Science museums (if they have not been altered to fit an idea of what is appropriate for a 'child's club' that can be too low a level) are fantastic places for gifted children.
The regular class time in a school setting can provide an idea of what it could be like to work in a lab, but, there are real issues in those settings for people who learn differently.
We are trying to find the right balance, too. Reach out to the scientific communities closest to you. Find the annual science fair for a large metropolitan area. Order or find the library with the scientific journals like Nature. Keep in mind the issues around the debate (Creation, Evolution, Both). Check out Bill Nye the Science Guy who was on C-Span maybe a week ago on that very debate. If you are not opposed, Darwin's Origin of Life makes for a nice text. Look up Jane Goodall's kids' club about nature. There are some students around us who are discouraged from exploring science because their parents think the subject will lead them away from their religion (very touchy subject), but there are plenty of people who believe that science and creation are compatible depending on interpretations. Good Luck and great job helping your child. (Sometimes I joke to my spouse that we might have to move to Asia for a while if we really want science education below university level; humor helps in these situations.)
