This would be a huge increase in their risk if you add boss monsters into RuneScape gold the forests. However, that's only possible when the areas are large enough that you can go around them if you know the exact location of your. Make the in-game maps less precise. The feeling of adventure could be enhanced greatly if players were required to investigate each region before it was documented in the map. It's a bit alien to explore new lands.
Have fewer artificial barriers. This can be a major break in the immersion. If cliffs could be climbed, but required time and resources, if boundaries weren't literally wooden fences we could jump over and rivers weren't just actual walls, but rather obstacles that could be swam over if you had the proper equipment, that would be fantastic.
There are monsters, but they're not enough to make you a subject to them. There are training spots but no reason to make use of them. It's not easy to lose yourself in the esthetic of the landscape because there's nothing to get lost in aside from aesthetics. You're waiting around to get to the next destination, which, may be in part, with your suggestion of increasing the level of difficulty, but it'll take more than the amount of time.
It's a great aspect. Jagex has made a few attempts to solve this issue, but it's not really effective for veterans. These are the main ones: Quests. I visited Karamja to quest, same as I went to the desert and Morytania. This is why you must go to these places. However, the issue is that when you've completed your quest, you are done.
Slayer. This can make you unable to take on. Many slayers are bound up in dungeons. However, that is an inevitable result of opening certain areas to all: I cannot effectively run through a space with buy 2007 runescape gold aberrant spectres without the proper gear.