Although many decide to plan their own tours, some may find this a little daunting because of the quantity of wineries and the size of the region. There are various tour operators within Mendoza who arrange personal or tailor-made tours:

Ampora Wine Tours offers exclusive wine tours. Tel: +54 (0) 261 429 2931.
The Grapevine arranges small group tours and has native English speakers. Tel: +54 (0) 261 429 7522. 
Raisin Argentina specializes in exclusive wine tours with gourmet food and premium wines for individuals and groups. Tel: +54 (0) 261 496 1445.
Bike and Wines provides maps, bikes and arranges your tour on bike. Tel: +54 (0) 261 410 6686.
Uncorking Argentina offers tailor-made wine tours. Tel: +1 (0) 916 396 0456. Toll free: +1 (0) 866 529 2861.
Mendoza Wine Camp Tel: +54 (0) 9 261 6300026 or 9 261 3439929. Organises a one-day exclusive tour, a 5-day immersion tour, a week-long wine and culture tour and more. It also offers tailor-made tours.