Make sure you are on the
Official National Park web site. If it isn't .gov it is a travel agency or tour company that is trying to get you to pay for more services. All you need is to book your tickets for the Arizona Memorial far enough online. This is a must. Plan ahead. Please research. Order your tickets as soon as you know the dates.
Remember, all the concierges at the Hilton report and are paid by the HGVC timeshare department (even at the hotel) and they are rewarded and judged on how many they recruit for sales presentations. Most guests don't know this. I find this deceptive. But, that is how I feel. They are more tied to the sales department than to giving clients the best advice. They also get a commission from selling a tour than telling you to do it yourself.
I have taken numerous friends to the Arizona Memorial and the other attractions at the Arizona Memorial and National Park over the years. The process is easy and there are numerous ways for you to get there economically. No need to pay for a corporate bus tour full of tourists unless you are in need of being taken care of from pick up at hotel to drop off when the tour is finished. It depends on your style of travel.
1. Reserve tickets ahead of time (as soon as possible during busy season)
2. A. Take the bus from the Hilton (there are multiple options) It takes about 50 minutes to an hour and 10 minutes. B. As mentioned above take a bus to the airport and get a rental car for the day. C. Reserve a rental car in Waikiki. or D. Take a corporate group tour from your hotel if that is most comfortable for you. There are several options for you.
3. If you rent a car for the day then you can enjoy a drive to the North Shore, Kailua for lunch, a drive over the Pali, or a drive around the south coast. I love Oahu and it is one of my favorite islands (I guess I love them all. HAHA)
4. If you take the bus I suggest considering taking the return bus to Niko's Pier 38 for lunch or dinner. The Furikake tuna has been my favorite since the early 00's when it was a small walk up window. It has now evolved into a full restaurant on the pier. When finished eating the most delicious tuna grab a bus back to your hotel or add another stop at Ala Moana Mall.
Again, make sure you are on the official .gov site and do not fall for some marketing paid position on google designed to sell you group bus tours.