river Main
In the summer, a walk along the river Main is a nice thing to do. A lot of people will spend a sunny afternoon walking or sitting there on a lawn or playing frisbee or football. It's a relatively quiet area, considering it's in the heart of the city. Nearby cafes and restaurants allow you to have a drink in between. The only disadvantage is that it can be quite crowded when the weather is nice; try going during business hours on a weekday unless you're looking for a crowd.
Cinestar Metropolis
The Cinestar Metropolis cinema shows a couple of movies in English. Take U1/U2/U3 to Eschenheimer Tor or walk from the city centre.
Sportpark Kelkheim
(http://www.sportpark-kelk...) is a sports facility complex that features high rope courses, golf no membership required, indoor climbing and bouldering, squash, and other activities.
City Forest
Go for a walk in the City Forest Stadtwald in the south of Frankfurt. With about 48 square kilometres, it is regarded as the largest inner-city forest in Germany. Six playgrounds and nine ponds make the forest a popular tourist attraction. The forest can be reached via tram line 14 direction Neu-Isenburg/Stadtgrenze from Frankfurt South Station Frankfurt Süd. Trams 12, 19, 20 and 21 also connect the Stadtwald with downtown Frankfurt.
Feldberg mountain
Go on top of the Feldberg mountain, the highest mountain of the Taunus. Take a train from Frankfurt central to Königsstein and then go to the main bus place ParkstraÃe. Busses via Feldberg depart every 2 hours. Get on top of the observation tower at the Feldberg. If it's cold, have a hot chocolate with cream HeiÃe Schokolade mit Sahne at the tower's kiosk.
red light district
The red light district with large brothels, porn cinemas and bars is located just east of the main railway station.
swimming
Go swimming at Titus-Thermen or Rebstockbad, which both also have whirlpools and sauna facilities. Or visit any of the other public indoor or outdoor pools in Frankfurt (http://www.bbf-frankfurt....). Some of the bigger complexes outside the city limits include Taunus-Therme (http://www.taunus-therme.de) in Bad Homburg and Rhein-Main-Therme (http://www.rhein-main-the...) in Hofheim.
Try the local cider "Apfelwein", especially that made by Possmann. The "Frau Rauscher" edition has a pleasant natural taste with some yeast left into it.
Frankfurt is one of the better locations in Germany to start looking if you want to find a job. It is the center of national and international banking/finance and there are also many high tech, chemical and pharmaceutical companies in the Rhine-Main area. All of these are more willing to accept people with no or less than adequate German skills if you can offer any other special skills.
Last but not least the airport and companies working for trade fairs always need people who speak English and other seldom spoken languages. Especially low skilled and very high skilled jobs are available. Make sure you have the proper permits and papers; working illegally can get you into a lot of trouble.
Fairs
Frankfurt Book Fair
The largest event of the world's publishing industry, held yearly in mid-October. The Frankfurt Book Fair has a long history, first being held in the year 1485, shortly after Gutenberg's printing press in nearby Mainz made books much more easily available than before. The last two days Sa-Su are open to the general public, with book sales allowed on Sunday only. In recent years, the public days of the Book Fair have also drawn a vast contingent of manga/anime fans, many of whom dress up as their favorite characters! Photography is allowed, but only after asking permission.
Frankfurt Motor Show
The world's largest motor show and Frankfurt's biggest event, held every two years, next on Sept. 2013. In even-numbered years, the show is held in Hannover.
Frankfurt's trade fairs are known to have taken place as early as in the year 1160. The Messe Frankfurt (http://www.messefrankfurt.com/) is one of the world's largest exhibition centers, hosting a continuous stream of exhibitions small, large and gargantuan — the Motor Show draws almost a million visitors. Most fairs are open to the public for at least part of the time, and can be a fascinating if somewhat overwhelming experience if you're interested in the theme. The Messe has its own train station, Messe, two stops away from the Central Railway Station from platform 104, underground on S 3/4/5/6, and there's also a Messe station on the U4 subway line. Advance tickets for fairs often allow free use of all RMV public transport.U4/U5 to station Messe/Torhaus; trains to the trade fairs will be announced in English.