If you are driving there are many more options?
Cnicht is a great little walk, and from the south looks like the matterhorn as you approach 🙂 , but nothing too strenuous and some nice views on a good day.
Tryfan is amazing if you have good scrambling ability and a head for heights, but if its icy or snowy, probably best left until good weather. What about parking in the Ogwen Valley and walking up the Devils kitchen? Lovely rocky amphitheatre and not too high if the weathers bad. If the weather is good and you feel okay you can carry on up Glyder Fawr, which is like a moonscape!
Snowdon itself has many routes, pyg track and miners track from Pen y Pass are okay and you can loop from one to the other without heading to the summit. I wouldn’t bother with the Llanberis path, as it is boring and probably crowded. Watkin path is great but long.
Moel Hebog, Moel Siabod, both nice smaller peaks. The Nantlle ridge is also very nice lower level walk from Rhyd Du.
It goes without saying that you need the right gear and map and compass for most of the above routes, and a knowledge of how to use them.