If an adventure packed holiday is what you have in mind, Nepalganj is a wonderful option. Short treks, untouched beauty and a peek into simple village life.
The city is home to people from various districts thus making it a multi-linguistic, multi cultural hotspot. Though there aren't too many touristy spots here, atleast not the typical ones, there is much to see. Gharbaritole, Ganeshpur and Sadar Line are some places you can visit though it's best to consult locals on what there is to do.
For those of you who are planning a trek from Nepalganj, do consult the villagers for any expert tips and also look for a hotel within the village. Though you will not have too much to choose from, what infact is available is quite good.