You should reach Delhi in morning , visit places by metro, there are many places worth visiting, if you want a more intimate feel of Delhi then take Uber, but be warned its costlier in morning. The people are more than accommodating, and helpful, and make a plan before you leave. Don't visit places which are too crowded at a particular time, you can check on maps the times when its most crowded plan accordingly. Download the Delhi metro app it will be great help. If you have destinations planned may be we can help more.