If you go in March I recommend visiting Rohtang Pass because it is covered in snow in throughout the year. Solang is very low lying & you might not be able to play in snow. Temperature in Manali is cool throughout the year.
While in Manali during the summer months, you can explore nearby attractions such as Solang Valley for adventure activities, Rohtang Pass for stunning mountain views, Hadimba Temple for its unique architecture, Vashisht Hot Springs for a relaxing soak, and Old Manali for its charming cafes and shopping options.