One thing I thoroughly enjoyed in some of the earlies RGP`s I played was finding secret/hidden places.
The reward for checking behind that
- waterfall to find a tunnel
- climbing that near impossible mound to find a plateau
- taking the risk of swimming up that underwater cave
- bashing at that slightly discovered wall to find an entrance
I hope there are elements on the maps that only become revealed to these that go the extra mile to find things!