There are some very accessible places to ski around here :
http://www.winter.frankenjura.com/deutsch/alpin.php3
Berggasthof, Rothenberg 1, 91220 Schnaittach (09153-8480)
It is a small slope, with a skilift for small children. We did only sleigh, but it was great fun.
Via motorway, this is 30 minutes only from Erlangen.
Bodenmais
This is a great ski resort no more than 2 hours driving from Erlangen, close to the Czech border.
You will find here a nice alpine ski resort and a fabulous cross-country ski area.
Rental is possible in the city.