Ghorepani Poon Hill trek is best trekking region in Annapurna Region Trek which can be completed 4 days to 5 days. This trek is cultural and natural too. In this trek you cross the route via Rhododendron trees with big jungle. Also Pure Gurung villages, culture and life of Gurung people.
It is depend on your time frame, maybe you should have 4 days or 5 days for good walking.
It costs normally start from 275 USD and includes all permit, TIMS, transportation, meals, accommodation and trekking guide. If you only want to hire a Guide it costs 22 USD per day and Port is 16 USD per day. He carries 15 KG (kilo gram)