1. Login
https://www.google.com/mymaps using your Google Account
2. Click on +CREATE A NEW MAP in the top left area

3. Search for the area that you want to download in high resolution and zoom in or out to till you see the area in the desired level of detail.

4. Choose the "Base map" style that suits your needs, as you can see on the image below.

5. Click on the three dots next to the Title ("Hong Kong, boaa group Limited" in the above picture) and select Print Map from the dropdown menu.

6. Pick the desired paper size (if in doubt pick Tabloid), orientation, and select Image as your output type.

7. On the following page cancel the print dialog and right-click the picture to select Save as from the dropdown menu and store your the image somewhere on your computer for further use.