I assume you're staying in the Kapalua resort (Ritz carlton?) since you asked. The resort itself has a few good eating places (sansei restaurant & the restaurants in the Ritz are good) and the golf is awesome but $$. The PGA has the annual mercedes championships at the plantation course there. Lahaina is nice - there's a ruth's chris on front street. Not much in kaanapali for food - mostly shopping. The golf there is okay too, but kapalua is much better for your $$. The other things the previous post mentioned are good to see too, but haleakala and hana are VERY far from Kapalua so plan accordingly - check google maps for travel time & distance.
2007 E92 335 - Manual, TiAg, black leatherette, sport package, alum trim, CA, & Assist; Ordered 11/7/06, Born on 1/5/07, Delivered 2/23/07.