There any number of companies offering tours of Buenos Aires – if you’re pressed for time or you’re traveling alone, then this is often the best option to get a feel for the city in just a few hours. Most travel agents offer city tours with optional extras such as visiting an estancia or taking in a tango show. Any of the following will be able to arrange such tours:

ATI, Esmeralda 567. Tel: +54 (0) 11 4329 9000.
ASATEJ, Florida 835. Tel: +54 (0) 11 4114 7595. Student discounts and cheap flights.
Barbacharters. Tel: +54 (0) 11 4824 3366. Boat trips in the Tigre delta.
Buenos Aires Tur (BAT), Lavalle 1444. Tel: +54 (0) 11 4371 2304. Offers both city tours and boat trips around the Tigre delta.
Buenos Aires Vision, Esmeralda 356. Tel: +54 (0) 11 4394 4682. Tango dates, city tours, Tigre delta.
Cicerones de Buenos Aires, J J Biedma 883. Tel: +54 (0) 11 4330 0800. Volunteers offer guided tours.
Cacciola Viajes, Florida 520. Tel: +54 (0) 11 4393 6100. Spanish/English.
Class Adventure Travel, Avenida Presidente Roque Saenz Pena 615.  Tailor-made itineraries.
Del Posto. Tel: +54 (0) 11 5272 0700.
Eternautas, Avenida Pte Julio A Rocca 584, 7th Floor. Tel: +54 (0) 11 5031 9916. City tours of Buneos Aires and the Pampas by lecturers from the University of Buenos Aires.
Exprinter, San Martin 170. Tel: +54 (0) 11 4341 6600.
Eves Turismo, Tucuman 702. Tel: +54 (0) 11 4393 6151.
Flyer, Reconquista 617. Tel: +54 (0) 11 4313 8224. Estancia tours plus fishing and polo.
Lan&Kramer Bike Tours. Tel: +54 (0) 11 4311 5199. Bike tours.
OpcionSur. Tel: +54 (0) 11 4777 9029.
Patagonia Chopper Flight Tours. Tel: +54 (0) 11 4795 6410. City Helitours.
Smile on Sea. Tel: +54 (0) 15 5018 8662.
Special Buenos Aires. Tel: +54 (0) 15 4141 1776.
Tangol, Florida 971. Tel: +54 (0) 11 4312 7276. Specialises in tango and football and also offers city tours, estancia visits etc.
Turismo Feeling, San Martin 969. Tel: +54 (0) 11 4313 5533.
Urban Biking, Moliere 280. Tel: +54 (0) 11 4568 4321. Bike tours.