Inverness has a 12 o'clock curfew. You will not be allowed to enter any pub or club after midnight apart from the one you are already in. So don't get caught out as some pubs close at midnight and then your night ends!
There's plenty of live music and good lively atmospheres around so have fun exploring. Hootananny's is the chief of those, offering predominantly celtic entertainment.
As in all Scotland, all enclosed public places - which includes all eating places and bars - are non-smoking. A few have outside seating areas.
On a warm summer's evening, the Dores Inn on the northern shore of Loch Ness east sideis a particularly pleasant place to linger over a beer. They do good, traditional pub food, too.