I'm planing a trip from WAW-SSH. Outbound I'll have a 8h layover in the afternoon, inbound a 12h layover, arriving from SSH 7am. I'll be travelling in J and also have *G status.

I read the lounge is open 24h, Is there anything to do so not to get bored after 8 or 12h, spa, massage or anything else?
Any other options to spend that time, maybe go to the city?