Two things: first, just FYI and you might already know this but Toontown doesn't open until one hour after regular park opening, so two hours after EMH. Also, they do a cute little opening where some characters come to the gate and will walk into Toontown with the kids, very sweet. If you head immediately to Mickey or Minnies house there will be almost no line to meet them.
Next, if you are using rider switch know that you only need one FP per ride. One person rides with FP and the other person gets a riders switch pass on their ticket with a return a short while after the first person rides. You go up together to the FP line, get the switch on the other person's ticket and then the FP rider proceeds into the line and you can go do whatever until they are done.
Because you don't need two FP per ride you can hold double the fastpasses, a nice perk.