Best decision...you'll have a relaxed last couple of days! When you get to Zurich Airport, you walk through to the Radisson Blu - there are signs. When you are ready to head into the city, just go back to the shopping center building that you walk through to get to the hotel and the train station is there. Trains every few minutes and it takes about 12-14 minutes to get to t he city center. On the street level of the main train station there is a tourist information office (stand with your back to the tracks and it's at the far end of t he building on the left hand side) where you can get a great pocket map of Zurich and they can tell you if there is anything special going on. Try to stop by the Fraumunster to see t he Chagall stained glass windows....I'm not a big modern art fan but these windows are stunning...it's about 10-15 minutes walk from the main station and in the prime area for visitors.
Have a great trip!