The main reason to visit SR is to explore the many buddhist and hinduist temples of Angkor Wat, not far from the town.
To do this, you can hire a motorbike with driver, who will show you around the place.
In the Bayon temple you will find on the walls of the first floor many carvings depicting scenes of wars, court, cities of the times when those temples and palaces were constructed.
They have amazing details, some are brighter (restored) than others, but the temple well deserves a slow look around, admiring each and every wall.
If you have a lazy afternoon free there, a walk by the riverside is a pleasant activity. There you can see how local everyday life goes, easy, calm, lazy.
Sit at any of the benches there under a tree and watch the other bank. The river is small, there is no boats activity, but you can see people passing by and relax...
In SR is easier for a tourist to call overseas than to call to Phnom Penh to reserve a room!!
If you wanna call overseas, U just go to any of the many internet cafes and U do it instantly and cheap.
BUT if you wanna call local U gotta look for these phone boots with these number (provinces codes) writen on them. The prices for each code are written there too.
You go there, ask for a call, and the lady there gives you... HER CELL PHONE! so you can just dial yourself. Afterwards she cheks on the screen how much did U talk and charges U for that...
Favorite thing: If you need to purchase paracetamol in Siem Reap, it cost us 3000 riels (less than 50 US cents) for 10 tablets (500 mg) from a local pharmacy on Sivatha Boulevard. It was made in Thailand.