Any suggestions as to what I should do for my long (10 hour) connection?

I'm arriving from BLR into DEL on AI (AC Codeshare) at 19:50. My connecting flight DEL-YVR departs DEL at 05:45 the next morning on AC. This is on a single ticket, so I think AI should be able to issue me the AC boarding pass in BLR. If not, I assume that there should be AC personnel available to issue it at the transfer desk, since AC also has a flight DEL-YYZ that departs at 00:45.

I'm not *G (only *S), but I'm flying in business class. I'm hoping that there would be a decent lounge available to me. If not, or if I wanted one of the in-terminal hotels such as the Holiday Inn, which would be the best choice - domestic or international?