Starting to take shape

I'm using the City of Cthulhu for this small map for a friend's campaign.

I'd like to know how I can export the file in the highest quality possible, since exporting with JPEG Quality gives me a small, pixelated file on the street lines when I zoom in below 100%.

This will be for an A0 print.

Thank you very much.

Mike Schley Overland has a beer mug icon.

These two options would be cool, it seems like a good style for the Traditional Overland.