You've already mentioned Sandown, another lovely course. I've nivva done Royal Haskit (except that year when it was at York, which dizzent count) & I'm not sure I'd like to. For me, they all pale when compared with Cheltenham. Or Sunderland dogs....Done most of the northern & south east courses ( btw Chelmsford is the worst viewing by miles but a canny restaurant ) + others like Cheltenham, N Abbot, Salisbury etc. Did a Fri night meeting at Wolver night before WBA couple of yrs agan. Floodlit horse racing had been on my list.
Might try & tie in a home game with Hexham &/or Cartmel next season. Not done Uttoxeter either ( but been passed it loads of times on trains from Wakey to Stoke/PV.