We spent 6 days there in September; our third trip back (twice south rim, once north rim). Last trip was the south rim. We camped at Trailer Village; excellent. We hiked Bright Angel Trail (to the 3 mile point - 2,000 ft vertical), the entire south rim trail, went to Desert View Tower, enjoyed a great dinner at the Arizona Room at a table with a view of the canyon, explored the Grand Canyon Village, the El Tovar, Bright Angel Inn and more.
The $25 is the entrance fee to the park and you can do a LOT more than just "have a look" without spending any more $. The $25 is for the vehicle, not per person. In my opinion, even a look is worth the $25. Defines the term "breath taking".
Some pictures:
SunsetBright Angel TrailOther Grand Canyon Pictures