You cannot visit Tatta pani and Poonch river in such short time as u will have to use Mangla Mirpur to Kotli road for this.
You can visit Banjosa and Tolipeer.
From Rawlakot, there are 2 routes for Muzaffarabad:
1- Rawlakot - Bagh - Sudhan Gali - Chikkar - Hattian Bala - Muzaffarabad
2- Rawlakot - Dhalkot Bridge - Kohala - Muzaffarabad
Both roads are not in perfect conditions and there are quite a few bad patches. But vehicles are easily moving on both roads and hiaces are the public transport mode.
Then there are longer routes to reach Muzaffarabad like through Kotli Sattian and even Murree but i think u won't prefer those.
1.5 days are not even minimum requirement for Neelum Valley.
Better visit Muzaffarabad and Pir Chinasi. Even if u go for Keran then it will be touch & go stuff and no enjoyment at all.