We have visited zell am see in summer and winter and its great for both types of holiday. The lake beaches and the water are so clean and there is so much to do for families. There is also more skiing than you think and its easy to get to the surrounding resorts if you get bored and are an expert skier, only 10 minutes by bus opens up another 300km of runs and of course the glacier means there is always snow! Even though the resort itself is not that high the snow conditions are pretty reliable from early December through to april and there are snow machines on every run. The views over the lake from the slopes are breathtaking and it gives a very special atmosphere to the town and the ski slopes, I have skied all over europe and frankly its the best all round resort I have even been to! I really recommend it!