Any person holder of an American or one of the 33 countries listed by the list of the Qatar Foreign Affairs ministry, can get inside Qatar by paying a fee100QR. (paid by a credit card or by a QNB card only - no cash accepted, at the airport arrivals desk, this visa is for 30 days, after that s/he has to to go the Passport and Immigratino office at the airport (located near the first parking lot infront of the big garden), that it is open 24 hours and all year long, renew the tourist visa for another 30 days by paying another 100QR. the same way as above, and then after that period s/he needs to leave the country, can get another visa the same way by proving when s/he enters to Qatar again that he camoe from another country. You can do this as much as you like until getting tired.