Flight
Given the time of day, AUS is a little over 20 minutes drive to the sculpture park/hotels. The airport is one of my favorites in that it has a lot of local businesses in it too!
Hotel
Hotel
These are converted apartments into hotel rooms, so good for families and groups who want to hang in a central location for a couple of days. There are studios for around $150 and then 1 and 2 bedroom options.
Hotel
These are other hotels we looked into that we have not blocked rooms at, but are close to the venue and seem like good options! Feel free to book your own hotel beyond the two above; there are many great ones nearby.