The village is a nice place to wander around for a few hours, even if you do not want to taste any wine. It has a medieval feel to it, with charming lanes, tumbling flowers, pretty squares and plenty of places to grab a drink and sit and watch the world go by. It's a fairly polished affair, no doubt thanks to its fame.
The tourist office arranges guided tours of the village during the summer months (for a small fee), but you can easily wander around and discover the village by yourself (you can also pick up Heritage Trail brochures that help guide you at the tourist office). Some of the sights to see include the Romanesque church Notre Dame de l'Assomption (from the 12th century), the chapel Saint Pierre de Luxembourg (from the 19th century), the chapel Saint Theodoric with its protected frescoes, and of course the ruined castle. Only a couple of the walls and a tower remain of this ancient Papal palace but the views from the top of a valley of vineyards with the mighty River Rhône in the background are sure to impress.
If you'd like to explore the countryside a bit more, you can do so by foot or by bicycle. There is a 16km walking trail which starts at the castle (circuit is brown trail) which takes you through vineyards towards the River Rhône, around in a loop to finish back in the village.
A shorter alternative is vineyard trail which leaves from La Maison des Vignerons. The trail follows fifteen marked panels with information about the vines and the area and you can choose between 3, 5 or 7km routes. For more nature, try the 10km path around Islon St-Luc. It 's a circular route that follows a river tow-path that takes you down to the Rhône, and has useful information boards around the route. There is also a much shoter walk that starts here, of 2km, which is suitable for families.
A cycle route around the vineyards starts in the village and takes you to Sorgues and Bedarrides before returning to your starting point. It's 28km and should take 2h30 - 3 hours. It's signposted all the way and is of an easy level.