I hate to be a naysayer, but you're probably not going to impress many people. I grew up on with the Mac and I have quite a bit of affection for the classic Mac, but it really doesn't compare to today's computers. The only part where it shines is boot time and kids could care less. People who are old enough to remember PC's before the Mac and Lisa are also old enough to be aware of the Mac and Lisa and how it revolutionized the industry. Anyone born after 1984 is probably going to be less than impressed.

You can try to explain how this computer made the current computers possible, but the kids will not get past the monochrome or 8-bit graphics and tiny screen. It's kind of sad, but that's progress. The comments and reactions you'll receive will probably do more to depress you than anything else.