Golfland is the perfect place for a hot summer day/night in Phoenix! I'd driven past it multiple times in my few years of living out here but never actually stepped foot at the place. One of my guy friends organized a group outing for Night Splash recently- but no group pricing for Night Splash. Totally understandable since it's only $20 for 4 hours of wet entertainment!
The old waterpark-only entrance is not used except as an exit. So we found out upon parking next to it.... gotta go thru the arcade maze. I definitely suggest getting one of the PIN# lockers instead of the key lockers, that way if you're with a group you're not having to share a key. It's quite easy to get separated from people with a group since the place is large and full of winding walkways.
I recommend doing all the slides, even if heights and/or water rides aren't your thing. The best one is probably the half-pipe slide in the back because it's an almost literal 90-degree drop into the half-pipe. Even though most of the staff looked to be half my age, they were all friendly and confident in their work knowledge. Every staff member we spoke with loved the idea of an adults-only Night Splash- totally would pay a little more premium if this could happen.