Good morning!
Your question sound a bit like 'what shall I make for lunch' when no-one has any idea what I like to eat and what food I have in the house!
However, here goes:
As the weather forecast for the weekend is not too good, I would spend Saturday in a bookshop and Sunday on the Internet if I were you.
Most bookshops seem to have plenty of maps, and books with suggested walks. (Wanderungen)
Orell Füssli will start you off.
Füsslistrasse 4
8001 Zürich (off the Bahnhofstrasse)
www.wandersite.ch/def_english.html
should give you a few tips too.
If you go up to 'Grumpygrapefruit land' (Flumserberg) there are masses of the most beautiful alpine flowers at the moment.
Toggenburg is a wonderful area and not too far from Zürich to start off.
As you are perhaps VERY new to Switzerland:
Walks in Switzerland are nearly always measured in TIME not in Distance.
Yellow Rhombus walks are easier going than the white/red/white of the 'hill tracks'. Usually they are all well marked. Unless the track is very clearly defined, you can see from one marker to the next.
Happy walking - Switzerland is a wonderful place to enjoy doing it.