Haast is a small village, blink and you'll miss it, but stop and stay for a night or 2 and you'll be suprised.
A trip to the beach is worth a visit. You can go for a scenic trip along the coast roads, or go up the mountains through Haast pass. Haast caters for tourists and there is a tourist info centre there offering lots to do around the area. The road trip from Haast inland to Wanaka, Cardrona to Arrowtown is a must see. It is one of the great viewing journeys that is underated.