We have a 4 hour layover at WAW, coming from YYZ-WAW, then WAW-CDG both on LOT J

Landing at 12:15 then departing at 16:35 for CDG. 4 hours seems like too short to explore the city, so I'm wondering what activities we can do at the airport. I noticed there are 2 LOT lounges on the airside, beside the lounges, any other recommendations?

Thanks for your input