I don’t know much about Sweden, but am excited to learn. Apparently I am in Kungsängen, and there for a few weeks. I won’t have a vehicle, but am confident we can plead for lifts or hire cabs.
Looking for any suggestions or tips of things to do and see…?
Why would you, when Sweden has an excellent public transport system?
In February?
Get a Netflix account or something. 
No, I guess you could go shopping, or try some of the many good restaurants in central Stockholm. Many museums have free admission.
Seriously wrong time of year to come though, Stockholm (and Kungsängen, which is very close) is fucking depressing that time of year.