If you look at OpenStreetMap, there's plenty of detail there (https://www.openstreetmap.org/search?query=dubai#map=13/25.2674/55.3366), so if you install the routable bicycle UAE map for Garmin devices from http://garmin.openstreetmap.nl/, that should get you wnat you need.
That site is no longer being updated.
Try https://extract.bbbike.org/ instead.
Use the "latin" version (not UTF8).
