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I agree with the others. Way too much for my taste. We just did our first long family trip last summer. We had 6 weeks and covered about a third of what you have planned. You may want to check out my link below to get an idea of how the pacing felt to us.
In short, we felt we had paced it out just about right, of course with the help of the fine people of this forum! You'll get some great advice here. In the end, it's your trip, but read and re-read the suggestions you get.
I look forward to seeing how this all pans out. Can you share more about what sorts of activities your family enjoys? Are you hikers? boaters? Relax and watch the sunset type? What do the kids like to do? The more you flesh this out, the better help you'll receive.