What is the voltage in Costa Rica?

The Voltage in Costa Rica is the same as the US, 120V 60HzHz and Uk plugs will not fit Costa Rican plug sockets. In order to use Uk plugs you will have to get a step down plug from 240v to 120v as just an adapter will not work.

How much do i tip?

Tipping is not part of the culture in Costa Rica but as more people visit and tip Costa Ricans are becoming more accustomed to being tipped. Usually 10% service charges are already included so tipping waiters is not necessary, however if he was a good waiter feel free to tip. Taxi drivers there is no need to tip. Porters and other service people are tipped usually and somewhere between $1-$2 is usually fine.

What side of the road do they drive on?

Not the same side as us, Costa Rican drive on the right hand side of the roads, so get used to changing gear with the door!

Is there any cultural things i should be aware of?

Well when in Costa Rica treat the country and people with respect as you do in your own country. the countries are very similar with regard to cultural things and apart from being very passive on the roads there is nothing too much.

Women however should not be surprised if men whistle at them as this is normal macho behavior in Costa Rica.

Is it true that i can bribe the police?

There have in the past been instances of this in the past however if you do get stopped by the police do not offer a bribe as you could find yourself in a fine Costa Rican carcel (jail). take the ticket and make sure you pay for it before you leave the country as re-entry in the future could be rather difficult.