Swimming Pool
Well not the most glamorous, but it's something to entertain the most stubborn kids!
Allalin
Visit the top of the ski resort, using the gondolas and the metro-alpin (http://en.wikipedia.org/w...). great views of the alps on a good day. in winter it can get very cold at the top, so wrap up warm. you can also have a meal in the revolving restaurant at the toppricey!.
Ski and snowboard
It's what it's famous for. the skiing and snowboarding is very catered towards the intermediates but there are a few runs for the more advanced riders. notably the plattjen lift has the more advanced terrain. the more easier runs can be found either in the village or on feechatz slope, just above langfluh. a quick word of warning about this run, it may be a nice run but you have to endure the longest t-bar lift (http://en.wikipedia.org/w...) and downloading is also recommended as the runs down are difficult for beginners and get very busy later on in the day. you can ski and snowboard all year with the exception of may and june, in the summer you can ski on the glacier with 8km of runs.
Wander the village
It's super nice at any time of the year, but in winter it really is quite nice.
Walks
Their are many walks you can do, more of course in the summer months than in the winter months. among the best routes are the route from saas-fee down to saas almagell, which can be done in winter and summer. there is a bus to take you back up. there are many other walking routes including the monte rosa path (http://www.tmr-matterhorn.ch/). ask at the tourist office (http://www.saas-fee.ch/en/), also the location to buy hiking maps.
Feeblitz
Bobsleigh but on rails, great fun, but expensive. at least do it twice, maybe even three times. prices about 6chf per ride, but can buy multi ride tickets and save money.
Snowboard Park
Increasingly popular due to the quality of the snow park. full information can be found on the snowparks web site (http://www.saas-fee.ch/fr...). the snowpark is open 10 months also and is increasingly popular with snowboard camps.
In the winter there are many more things to do such as:
Sledging
Go up to the hannig lift and hire out a sledge and go down the sledge run. it can be quite scary at first, take your time the first run down, as there are some sharp bends, and you really don't want to go over the edge!
Snow Tubing
Down in saas grund there is a tubing area. tubing is where you sit in a large inflatable tube of air and slide down the hill, normally spinning as you go.
Ice Skating
There is a natural ice skating ring and a man made one in saas-fee. you need to hire skates out from one of the hire shops in the village. also don't fall over... it hurts!
Cross Country Skiing
Very limited in saas fee. limited to one run infact. best to go down into the valley, where there are many km of cross country skiing.
Note: You can get money off many of these activities if you are staying in Saas-Fee. Take you Guest Card with you!