Here's a suggested itinerary for a Delhi-Agra-Shimla-Manali tour package:

Day 1: Arrival in Delhi

Arrive in Delhi, the capital city of India.
Check into your hotel and relax after your journey.
Depending on your arrival time, you can explore local attractions like India Gate, Qutub Minar, or Humayun's Tomb.
Overnight stay in Delhi.
Day 2: Delhi Sightseeing

Enjoy a full day of sightseeing in Delhi.
Visit popular attractions such as the Red Fort, Jama Masjid, Raj Ghat, Lotus Temple, and Akshardham Temple.
Explore the bustling streets of Chandni Chowk and indulge in local street food.
Overnight stay in Delhi.
Day 3: Delhi to Agra

Depart from Delhi to Agra, a journey of approximately 230 kilometers, taking around 4-5 hours by road.
Upon arrival in Agra, visit the iconic Taj Mahal, one of the Seven Wonders of the World.
Explore the Agra Fort and Itmad-ud-Daulah's Tomb.
Overnight stay in Agra.
Day 4: Agra to Shimla

Depart from Agra to Shimla, a journey of around 550 kilometers, which takes approximately 10-12 hours by road.
En route, you can stop at places like Chandigarh for a short break.
Upon arrival in Shimla, check into your hotel and relax.
Overnight stay in Shimla.
Day 5: Shimla Sightseeing

Enjoy a full day of sightseeing in Shimla.
Visit popular attractions like Kufri, Jakhu Temple, Shimla State Museum, and the Viceregal Lodge.
Enjoy leisure time exploring the markets and trying local cuisine.
Overnight stay in Shimla.
Day 6: Shimla to Manali

Depart from Shimla to Manali, a journey of around 250 kilometers, taking approximately 7-8 hours by road.
En route, enjoy scenic views of the Himalayas and stop at places like Kullu Valley and Pandoh Dam.
Upon arrival in Manali, check into your hotel and relax.
Overnight stay in Manali.
Day 7: Manali Sightseeing

Explore the local attractions in Manali.
Visit Hadimba Devi Temple, Manu Temple, Vashisht Village, and Tibetan Monastery.
Spend some time at the Mall Road and Old Manali.
Optionally, you can also indulge in adventure activities like paragliding, zorbing, or skiing (seasonal).
Overnight stay in Manali.
Day 8: Excursion to Solang Valley and Rohtang Pass (if accessible)

Head to Solang Valley, known for its adventure activities like paragliding, zorbing, and skiing (subject to weather conditions).
Optionally, proceed further to Rohtang Pass (if accessible), a high mountain pass offering breathtaking views and snow activities (subject to permits and weather conditions).
Return to Manali in the evening.
Overnight stay in Manali.
Day 9: Departure from Manali to Delhi

After breakfast, check out from the hotel and start your journey back to Delhi.
Upon arrival in Delhi, you can explore any missed attractions or indulge in last-minute shopping.
Drop-off at Delhi airport or railway station for your onward journey.
This itinerary offers a blend of historical, cultural, and natural experiences, covering the famous landmarks of Delhi, Agra, Shimla, and Manali. Make sure to check weather conditions and road accessibility, especially for Rohtang Pass, which may be closed during certain months due to snow.