Lisa -
I think this is going to have to be something that you work out for yourself, but personally I think it is too much. It sounds like you are setting yourself up to have a child that needs to be entertained and is unable to be content playing at home. Also, if you plan on having other children, this type of schedule may be very hard to maintain (It would be for me with a 3 yr old and an 8 mth old), which may make your days at home even more difficult.
I have also worked with many families that started out schedules like this and they continued when the kids started school b/c the kids weren't happy unless they were doing something 'special/fun' every night and they were going all the time. Kids were doing homework in the car every night.
Can you find things at home that you can do together? Playdoh, markers/scissors, glue, paint, bike, cook, etc that you can do to help the day go by? Even cleaning can be 'fun'. Yes, you have to redo most of what they do, but you are doing something and doing it together. :)
Good luck and have fun!
J.