as your break is short I would stick to one place and as for the santa park in rov - if you don't like commercial places then check it out first as it may not be to your taste
also - as you only have a short time I think you should look into the package deals but stay away from companies such as cantebury, transun etc as they are going to be too commerical I thinks
inghams do a 3 and 4 night santa break that does not include any trips, these you can book seperately and I have already mentioned the other two companies so check them out and see what you thinks
as for where to go - if you are going early dec then go as far north as possible so the ensure as much snow as possible, look at saariselka - it is lovely there