I played all of the Dunes' courses several years ago (2011) and we just booked our tee times and accomodations thru the resort. Average accomodations. Not plush like Pebble, but more than adequate. The houses are better than the hotel rooms, but you are going just to play golf, so who cares. Food is decent, but not high end. You are just going to play golf. You do have to walk each course (I think that is probably still the case) and we played 18 holes, 36 holes, 36 holes and 18 holes. We didn't take a break any day. I was 50 years old at the time. We had one 70 year old golfer that walked everyday, but didn't play 36 each day (only 18). The ground is soft (sand based fairways), so it is hard on your ankles and the soles of your feet. Bring very comfortable walking golf shoes and break them in before you go. I would certainly recommend walking 5 miles per day for about a month or so before you go. For the 2nd 18 holes that we played on 2 of the days, we didn't have a caddie, but their push/pull carts have big wheels and you can roll onto the greens, so fairly easy. Not terribly hilly (but compared to Louisiana, any place has hills). Definitely a trip of your lifetime. It normally takes all day to fly to and from Bandon (actually North Bend airport, about a 35 minute drive to Bandon), so plan accordingly. If you can fly private plane, certainly quicker. Golf is more like St Andrews than any other courses in the US. Putting can get crazy. The greens are so large that you can have 150 foot putts that break 50 feet. I think I am a really good putter (not a great ball striker in my older age), but I four putted several greens On average, at my local country club, I might have one or two 3-putts every 3 or 4 rounds.

I hope you have a great trip.
Regardless of my comments - it is a bucket list golf experience and one of my favorites. I hope to go again one day.