I'll try and get a feel for whether I need a second half day of lessons.
One of downfalls of the American skiier is the notion that after the first lesson, one never needs another and that as long as you can get down a run without falling, you're doing well enough. Believe me, if you've got the resources for it, take that half day, then go out and ride a couple of days to incorporate what you've learned, then do another half day to refine what you've been doing and learn the technique to move up the to next step, and so on. The steep part of the learning curve will go a lot smoother and quicker if you're getting regular course-corrections on your technique along the way and keeping the junk from accumulating and becoming part of your style.
My own experience was to take a occasional lessons during my first season (they were free with the place I worked), then I spent 3 more years getting in about 100+ days each and with no lessons. By my 4th season I thought I knew how to ski because I could keep up (barely) with the freestyle bumpslappers, and make it down anything without falling. On the other hand my technique was crap and I worked a lot harder than I needed to, still couldn't hold an edge very well on hardpack, and I felt like I'd been beat to shit after a day of skiing hard. During my 5th season, one of my ski buddies was an instructor who basically told me to forget everything I knew about skiing and then helped me rebuild my technique from the fundamentals up. This opened up a whole world to me and vastly improved my abilities on all types of conditions.
That 5th season was in the Alps where I was amazed to see British "holiday skiiers" who got in a couple of weeks skiing each year but were ripping it up on expert runs. Their secret was that during each year's 2-week vacation, they'd spend the first week in lessons. Back in the States their American counterparts with just as many ski days during their respective skiing careers were hurtling down blue runs out of control or doing the "snowplowing statue" zigzagging down the hill - they'd "took a lesson and didn't need no more."
Don't repeat my mistake - learn it right the first time. Take lessons frequently during your first season, and then occasionally for refreshing and improving your technique once you've moved past your beginning season.
As for where
to go, it doesn't matter much. Get the lesson wherever you can get the most for the $$. If they've got a pre-pay package plan, go for it. It doesn't matter which hill - with the exception of A-Basin, they've all got enough good, mellow beginner terrain for you to have continuous runs that you can learn on. A-Basin's terrain goes straight from Checkerboard Flats to runs that would be considered intermediate at any other ski area. Maybe someone knows the area better than I but that's my impression.
And have fun,