Overpass Turbo is one of my favorite OSM data tools - a simple man’s GIS.

Using the wizard, its relatively trivial to make simple queries like river to query for all the rivers from the map view.

Hidden in the cryptic query code editor is support for simple MapCSS based styling of the data.

The subway network in New Delhi (blue) and under construction (red) - View

Also try adding this piece to the query style block to display popups of all the station names

node[railway=station]{ text : name; }