If you make dinner plans at the Contemporary Resort then you do not have to pay for parking, you could park at the resort and just walk in, just let the Security Guard know at the entrance booth that you are dining for the evening and they will let you in. The viewing platform is located on the Concourse Level (Shops & Dining) of the resort, just walk towards BLT and you will see the platform to the left just before the BLT bridge, it is not necessarily the best view as there are slight obstructions from the Tommorrowland buildings (such as SM), but this also provides for a unique sight with the buildings lit up.