Pretty miserable today as cragchick says, but I did find a new bit of coastline to run along and a few trails in Culloden Wood I'd not been on before.
Welcome Vickhi. I do have a fondness for dark paths to challenge my night vision, but there are some good lit routes in Inverness.
1. I'd often try and add an out and back over the Kessock Bridge (walkways both sides, lovely on a still night, wild in high winds!) to a night run for some scenic miles, either turn around on the A9 where the street lights end or run down to North Kessock at the road where the cars turn off, continue under the bridge and up the steep road up to the walkway on the east side of the bridge. The last couple of hundred yards are unlit but it is easy enough to walk the steep uphill.
2. The classic night run would be down one side of the River, over the Islands, back up the other side to the Grant St bridge and back to your starting point.
3. The new housing estates south of Culduthel and the relief road or at Inshes give a range of hills and some nice views with lots of little tracks and cut-throughs joining the streets.
4. If it snows and there is a clear night the canal towpath is great, the snow reflects enough light and the towpath usually takes longer than the pavements to ice up.
Other than that I just meander the streets. If you want some sociable running the Inverness Harriers have a 'joggers' group on a Wednesday (we actually cover pretty much all ages and abilities) from whom I've learned lots of routes in the city. We also have a parkrun on Saturday mornings if you want to get a bit of racing practice in over 5km (or just get some fresh air in the morning!).