Not a single issue in going through Bellani to stay at the Marriott Ko Olina. The staff at the Marriott treated us like we were "owners" from the moment we checked in and during our entire stay. Pools get very busy on the weekends so if you prefer less traffic, then a mid-week stay is ideal. We used the Turo app to rent a car for the day and go to the North Shore. That worked well and we also took the free shuttle to travel to the Ka Makana Aliʻi shopping mall located in nearby Kapolei. Didn't love the restaurant choices at the Marriott so we walked down and ate at the "Off The Hook" restaurant at the Aulani. Overall, it was an outstanding experience and we would happily go back.