How to get drunk in Disney World: For Epcot buy the readily available alcohol all over the place. I highly recommend going during the Food and Wine fest. For Animal Kingdom buy the readily available alcohol. The bar in Harambe is pretty cool. Magic Kingdom is slightly more complex - go to resorts on the Monorail line, drink, then take the monorail to Magic Kingdom. Why is drinking in WDW even notable? It's not like they are dry.
I don't know where to score drugs in Orlando, but it's just a city, anyone who is comfortable scoring drugs on vacation can sort that out. If you drive you can bring a stash. I suppose you could if you flew too, seems sketchy to me, but I'm old now and risk averse.
Sex in the parks - ew. Seriously, the place is full of kids. Get a room.
Cheap tickets - there are a million Disney OCD blogs/forums to find discounts, that is not a "dark side."