There are a range of safaris that gets you up close and personal with these gentle giants. Always refered to as gorilla safaris by tour operators, there are various safaris ranging from day trips to long multi activity tours. There are different safari companies that operate these tours responsibly, taking care not to disturb these fascinating creatures.
Most bear-viewing tours are guided tours offered by tour operators though a few independent travelers organize their own tours. Gorilla Tours in Uganda and Rwanda typically have very high gorilla viewing success rates, often ranging from 90-100%.
Depending on the region and operator, tours range from quick day excursions (possible only in Rwanda) to multi-day adventures. Check with a tour operator in a particular region for information about gorilla tracking tour options available in the area.