What acts are Sunnah after completing Tawaf?

Here, the Sunnah is to go and drink Zamzam water, pour some water over one’s head, and then, if possible, touch al-Hajar al-Aswad again. Thereafter, one should proceed to perform sa‘i between Safa and Marwah. This is how the Prophet (peace and blessings of Allah be upon him) did it.