Banyan in Lihue is a great central location to explore the island, many amenities are walking distance, and even more are a short drive from the resort; unfortunately the area is right next to the cruise ship terminal, so everything is quite expensive nearby. The heated salt water pool is a nice addition.
I have a hard time recommending the activity concierge, but there are numerous tourist activity hubs in each mall and area that you go to that all offer similar "deals".
The front desk is very accommodating and helpful, and the beaches nearby are great for swimming.
The weather in the south is always better!