Start your first day in Manali with a visit to the Hadimba temple, a beautiful pagoda-style temple dedicated to Goddess Hadimba, wife of Bhima from the epic Mahabharata. Afterward, head to the Rohtang Pass, one of the highest motorable roads in the world, for stunning views of the Himalayas. Be prepared for chilly weather and don't forget to carry warm clothing.
Today, explore the picturesque Solang Valley, known for its adventure sports and beautiful landscape. Try your hand at skiing, paragliding, or zorbing, or simply take a leisurely hike. In the evening, head to the Manu Temple, a beautiful temple dedicated to Sage Manu, the creator of human race according to Hindu mythology.
On your last day in Manali, visit the Naggar Castle, a beautiful medieval castle that has been converted into a museum. Admire the stunning architecture, and check out the art gallery and the wood-carved temple inside the castle. Later, head to the Vashisht Hot Springs, natural thermal springs that are believed to have healing properties and are a popular spot for relaxation.
If you have more time, consider visiting the nearby town of Kullu, which is known for its scenic beauty and adventure sports. You could also take a day trip to the nearby town of Kasol, which is a popular destination for backpackers.
If you have less time, consider skipping Naggar Castle and spending more time exploring Manali's main attractions. Alternatively, you could skip Rohtang Pass and spend more time in Solang Valley.