To enter Hungary you must have a valid passport as evidence of your citizenship and identity. In Hungary, taxis have yellow licence plates and must have a metre able to give receipts. The post offices are generally open 08.00-18.00. You need a HUF 30 stamp on standard-size letters up to 20 grams, and HUF 100 on other sizes. The charge for letters and postcards sent by air mail is HUF 14 per 10 grams.
Stamps are available at the post offices and tobacconists.
Currency may only be exchanged at official places, and the receipts must be kept until departure. Buying and selling currency outside the official places carries a great risk which tourists should be well aware of. All banks are closed on Saturdays. Money can also be exchanged at hotel reception desks, and also at travel agencies on weekdays. Automatic exchange machines and ATMs operate after hours in Budapest.