The indicator I always look for is the species called "Moronimus Tourist Maximus". They generally are found when wildlife is present. They always tend to leave their vehicles in the road with the doors open and generally travel in herds. They generally have offspring with them and are easily identified, by the large pouch around their waist, which is used for storing food for a later date. Anytime, you find wildlife, these are generally present in mass numbers.
One stop we made was in the mud volcano area. It has a lot of thermally active areas. Cool stuff.
Lots of geysers in this area. Most are bigger and better than Old Faithful, just not as timely.
And we're walking...................