Fifth day of Hajj 12th Zil Hijjah

  Rami of all 3 Jamrarat 

Throw seven pebbles on each of three Jamarat after zawal (decline of the sun). It is preferrable to perform Rami before sunset but it is usually easy a little before sunset and at night. So it is permissible to do Rami at night if there is a risk to life.
 
1) Throw seven pebbles at Jamrah Oolah. Then move a little forward. And with your hands raised and facing Qibla, praise Allah and recite Arabic du' as or supplicate in your own words. There are no prescribed du' as.
 
2) After this throw seven pebbles at Jamrah Wustah. Here too facing Qiblah, praise Allah and earnestly seek his mercy and blessings. No particular du' a is prescribed here either.
 
3) Then throw seven pebbles on Jamrah Aqabah. But this time do not supplicate at all, after Rami just return to your place.
 
Jamarat in Detail

  Last chance for Tawaf of Ziarah

If you could not do Tawaf-e-Ziarah earlier, it is essential to do it today before Maghrib, along with  Sa' i between the hills of Safa & Marwah.
 
Tawaf in Detail
 
Sa' i in Detail

  Option 

After today' s Rami, you have the option to return to Mecca before sunset. But if the sun sets before you are able to depart, remain in Mina for the third night and throw pebbles at the 3 Jamarat the next day (13th Zil Hijjah)  in the same order.

  Tawaf-e-Wida

After Hajj, when you intend to return to your country from Mecca, it is Wajib (obligatory) to perform Tawaf-e-Wida (Farewell Tawaf). Its procedure is the same as that of a Nafl Tawaf.
 
Tawaf in Detail