Porbitora wildlife sanctuary is the good place for spend sunday if you are in guwahati.
I visit porbitora wildlife when I am in the guwahati me and my friend go there for some amazing wildlife picture.
if you wnat to enjoy there please go on the early morning between 6: 30-7: 30 if you go late so you can only enjoy jeep safari and the jeep safari cost is 700₹ per person and the jeep condition is very old and bad.
the good point I experience is the I see the rhino very closly and click lot of picture.
and dont forget to miss the tower from where you can get a great view of marshland