People in General are wound too tight in this world today. I ask "Why would you select Padre Bay" when you have a ton of beach just down from there.
I don't know if you were asking your question of me, Tiff, or someone else, but here is my answer:
1. Padre Bay has an abundant number of steep sand beaches (i.e. going from shoreline to +7 ft deep quickly) which is a requirement for anchoring my large cruiser. Luckily, this is not the type of beach that most houseboats look for and its definitely not a requirement for them.
2. The sandy beach options offer long stretches of beach that can accommodate several boats/houseboats being next to one another - great if you are anchoring with several families, which we do a lot in the summer.
3. Many of the beaches offer protection from wind/storms
4. The distance from the marina is under 2 hours cruising slowly, or about 30 minutes via runabout - nice for picking up/dropping off visitors mid-trip (which I try to avoid, but can't always do)
Contrary to your statement, for my boat's anchoring needs anyway, there are not a "ton of beaches" that work for us, especially not further up lake. In an early July trip this year, over two days, my wife and I and two dogs explored the entire shoreline on both sides of the lake in our dinghy from Dungeon Canyon to Forbidding Canyon (Rainbow Bridge canyon) going in and out of every nook, cranny, and canyon. (It was a lot of fun!!) We found exactly 3 beaches that could safely accommodate our anchoring requirements over this entire stretch of lake (and noted them for potential future use at the relevent water level).
We do love to go WAY further up lake when we can - i.e. San Juan arm, Escalante, Oak, etc., but when we must stay closer to the marina, you can't beat Padre Bay or Gunsight beaches (Warm Creek has good anchoring options for us also, just missing the red rock that we love).
And BTW, from now through May, we can (and do) stay in Padre Bay with little concern for the oblivion's who tend to ruin the Lake Powell experience for many all summer.
The below photo was taken late afternoon December 28, 2017 with us anchored right in the channel in Padre Bay (where we would NEVER consider anchoring at any other time of the year) - not a single boat had gone by for over 24 hours when this photo was taken.
