call disney dining they have shuttles that run before parks open. thats what we've done in the past
We found the best way for us is to drive our truck to the TTC and take the monorail from there. It seemed to get us there a little earlier than the boat-CR-monorail route. That was to get to CP and CRT but it would work well for 1900 too. I don't know if you are allowed to park at GF if your not a guest there. That would be the best way if it is allowed and you have a vehicle.