your negotiations skills. You can share the costs if you travel with someone. If you take a Taxi, driver will ask you to pay 100 bath or 3 dollars each and he will wait till he has 4 people on board. You do not need to pay toll fee for passing the bridge in tuk-tuk or taxi. It's included in the price.
If you take a moto it might be possible that you have to pay toll a fee for the bridge (1400 riel for a moto), which can be paid in riel, USD or baht. The rate is stated on the toll booths: it's better to hand over your money at the booth so that your fare is not impacted later.
Current exchange rate is 1 USD = 4000 Riel
Your driver will likely offer to exchange money to riel at overall poor rates - just politely refuse, there is no legal requirement to change any foreign money into Riels and the US Dollar is the de-facto consumer currency of Cambodia. There is of course a legal tender in Cambodia. In Koh Kong, and other border provinces, Thai baht is also accepted, but you'll get better rates if you exchange baht rather than shop with them.
If you're continuing further into Cambodia, beware of overpriced bus tickets: US$15-30 or more - do not agree to this. Agencies may tell you that the normal price is US$25 or 30, and, as such, USD15 is a big bargain - this is not true. The proper price to Phnom Penh is 25000 riel (US$6) if you get a ticket for US$8 you are doing well!
Cambodian Immigration
While problematic officials are increasingly less common, there are some old tricks that may be worth being aware of.
After you get your passport stamped with the Thai exit stamp, walk down the road, and the arrivals office is on the left side of the street. Ignore the fake quarantine station . If you allow the touts to direct you there, they will take your temperature, give you a bogus form and ask for 20-400Baht. You do not need this form and you will not be
