Morning: Start the day with a visit to the Hadimba Devi Temple, a four-story wooden temple with intricate carvings dedicated to goddess Hadimba. After that, head to the Manali Nature Park for a nature walk and to see various animals.
Afternoon: Indulge in some adventure sports like paragliding, zipline, and river rafting in Solang Valley.
Evening: Explore the Mall Road to shop for souvenirs and taste local delicacies like Momos and Thukpa.
Morning: Start the day early and drive to the Barshaini village, the starting point of Kheerganga trek. During the trek, enjoy the lush green forest, waterfall and the beautiful view of the snow-capped Himalayas.
Afternoon: Reach the Kheerganga peak and take a dip in the natural hot water springs. Relax and enjoy the scenic view from the top.
Evening: Trek down to Barshaini village and return to Manali. In the evening, spend some time at the Old Manali to see the local lifestyle and enjoy live music performances in cafes like Lazy Dog or Cafe 1947.
Apart from the above itinerary, you can also visit Rohtang Pass, which is only accessible from May to November, for a snow adventure. You can also go for a day tour to Naggar Castle, an ancient castle with stunning views of the mountains. Another suggestion is to visit the Vashisht Temple and Hot Springs, which are famous for their therapeutic properties.
To maximize your fun, try to book your trek in advance and carry appropriate trekking gear. You can also explore the local markets in Manali for some unique handicrafts and souvenirs. Lastly, don't forget to try the local food like Dham, a traditional dish made of rice, lentils, and vegetables, and Siddu, a local bread made with wheat flour and stuffed with vegetables or meat.