If you can hang around in AK after sunset it's quite the site. It, of course, depends on the night, the hours, and the season but it's an incredibly nice, peaceful park to be in at night.
The stuff that they're adding it should make it a nighttime park. I don't know when that'll be done and, as it is now, it's a wall-maze in there so the best you can do is to look at the hours which it's open and try to get there, if it works, in the early-mid afternoon. You'll still be missing out until they remove all of the walls.
The good news is that they're trying to fix it. The bad news is that it kind of sucks right now (for something that is, otherwise, quite a beautiful park).
