Megatlon (locations all over the city) rates begin at $50 and go up to $400 for a month membership, but be wary as they will try to sell you the most expensive package. Push a little to get better rates. Some locations have indoor pools, and all have weights, machines, classes, and athletic courts.
Le Parc (two main locations, one in Microcentro at San Martín 645, and one in Caballito at Yerbal 150) day rates start at $30. These gyms are small, but updated and modern, with a cafe, sports shop, and sauna.
Sport Club (locations throughout the city) day rates begin at $25. They offer a variety of classes, most locations have small indoor pools, and some have athletic courts as well.
YMCA (Reconquista 439, 4311-4785) is great on a budget, with day rates starting at just $20. If you are a YMCA member, bring your card with you and get a free pass for the month.
There are dozens of top-notch golf courses throughout the city and the surrounding areas, including Uruguay. The websites listed below are directories to help you narrow your search from the plethora of options.
Golf in Buenos Aires is a directory of the golf courses all around the city, with rates and schedules listed. The website is in English and Spanish, and gives contact information for all the courses as well as a description and photos.
BA Golf Outings is another directory, with the website in both English and Spanish.
Campo Municipal de Golf (Tornquist 1426, 4772-7261) is open from sunrise to sunset Tuesday-Sunday.
Costa Salguero Driving Range (corner of Avs. Costanera R Obligado & Salguero, 4805-4732) is open from 8am-6pm Monday-Sunday.
Parque General Belgrano is located …