Varadero can be fun.
In January winds are mostly ne-e so be sure to stay at the few resorts at the tip.....
....all the other resorts face west and you end up in big wind shadow and then blowing off shore in Ne/e winds.
If you are only there for a week, do not take up your time by traveling all the way to Cayo Guillermo.
You should stay two weeks.............or go to Guillermo for better wind but poor night life..
Corne is going to Varedero in January and I think he is staying blau marina varadaro. at the tip.
This is nice place and great location, that used to be the barcelo marina palace.