Continuing of Verns line, that tube is usually vented into the airbox as part of epa regulations. It is ok to vent it but you may want to put a filter on the end to prevent dirt from coming back in.
Also, you might have a smaller line from your carbs, I have different carbs but I have a small vent line there and it just lays on the top of the air box and does not plug in to anything.
The ride IS the adventure. The destination is just to get gas!