I feel like I have to start off by saying that this post is not affiliated with Westin or the Westin Hapuna, or the state of Hawaii....
You could order from the waitstaff walking around {this service was a bit slow}, or you could walk up to the bar to order the drinks yourself {faster service, although I sometimes felt a little rushed when ordering drinks; there were usually two bartenders on, and they were understandably busy}.
Aside from all the amenities I just mentioned, there was a kids club that we never ventured to, a spa that we couldn't squeeze into our schedule, the gym that nobody really had the will to visit, and the Meridia restaurant open for dinner, that didn't seem suitable for small kids.
When we weren't eating out {somewhere else on the island}, we had dinner at the Naupaka Beach Grill one night, Piko for apps and drinks another night, and got room service our second to last night, after a very long day of driving and exploring the island.