For a bit of context, I’ve gone from wing → downwind sup foil → parawing, and had my biggest early breakthroughs in the Gorge.
The hatch is the best spot, but be aware it’s a bit of a zoo as a result of it. If you stay on the edges of it (i.e. upwind of the parking entrance, downwind of the windsurfer launch, or South of the middle of the river) you will be out of the way of the most crowded rotation which requires you to be competent and keep your head on a swivel.
There are other spots - but Viento and Stevenson do not have regular solid bumps … and you need real bumps when you are just getting started. If Rufus or Rowena are on, then all the better - Rufus is the best when it’s firing.
One last thought - you don’t need to paddle or parawing to learn to DW, but it’s incredibly rare to meet a winger-only who can glide indefinitely. Resist the urge to pull in on the rear handle!