We selected a full day safari trip so we would have a guided tour of the park which could help us for a return visit later. Jeffery was our guide and he was wonderful! There were only 6 of us plus Jeffery which made for a personalized trip. We appreciated his vast knowledge of history, geology and conservationism. We saw quite a few animals--elk, bison, osprey, deer, pelicans. Even though noise and bear eluded us, we learned so much about the behavior of all of Yellowstones creatures. We also appreciated being able to see "gems" of the park we may have overlooked it simply avoided due to the crowds. The picnic lunch was excellent and Jeffery was conscientious about test stops. In all, a long day, but so worth it. We returned to the park on our own 2_days later armed with great animal spotting skills. I would do it again in a heartbeat!