Vineyards are the topic of this WHS, and they will be extremely visible since the beginning of the trip on Pico island, coming via boat to Madalena. There are a few nice spots where to see from above the particular landscape, made of irregular lava bricks. I'd say that the main places to see the vineyards are around the wine museum at Madalena (which is worth a visit, also for the low prize), the Moinho do Frade (a bright red windmill in Criacao Velha), but the most amazing one is the view from Prainha Forest Park. You will get the chance to see many vineyards along the way, in any case. A bit out of topic, but we tasted several wines during our Azores vacations (all from Pico island) and some were better than others, but nothing extremely special. In addition, this kind of vineyard can be found very similar in Canary Islands. Pico is a very big island, but there are a few villages and 4 days may be the maximum amount of time you can spend there (whale tour excluded).