Arrive at the airport, get to your hotel and check-in. Take a stroll around one of New Delhi's many parks in the evening, like the Lodi Gardens or Nehru Park. End the day with dinner at the Indian Accent restaurant in Lodhi Colony.
Take the morning train from the New Delhi Railway Station to the Joginder Nagar Railway Station. Hire a taxi from Joginder Nagar to Manali which is a four-hour drive. Check in the hotel and then continue to stroll the nearby Hadimba Devi Temple premises. Enjoy lunch at La Plage for French cuisine or head to Drifter's Cafe for coffee and snacks.
Visit Jana Falls (32 km, 1 hr) early in the morning for a refreshing dip in the waterfall. After some relaxation and photography, visit the Manu Temple (3 km, 12 min), which is dedicated to Lord Manu, the Hindu sage who is believed to be the creator of human race. Don't forget to grab a quick snack from Il Forno or Red House Cafe and end your day with a calming foot massage at Ayur Sparsha.
Enjoy breakfast and checkout from the hotel. Hire a taxi from Manali to Joginder Nagar Railway Station. Take the evening train from Joginder Nagar to New Delhi Railway Station. End your day with dinner at the famous Bukhara restaurant in ITC Maurya hotel.
If you have more time, add a day out in nearby Solang Valley for adventure activities like skiing, cable car rides and paragliding. Also, check out the Tibetan Monastery, and Naggar Castle in Manali which has spectacular views of the Kullu Valley. If you have less time, skip the evening stroll and foot massage. Remember to pack sunscreen and sunglasses, as the sun in this region can be quite strong, and carry enough cash for remote areas where ATM availability might be challenging.