Jagex added a harder agility course for players with 85 agility or higher above the main Agility course. This course will give weight reducing clothing to players who complete 250 laps without failing.
There is a mining location under the tree, accessible only after you have completed The Grand Tree.
There is a tortoise pen to the northwest and a terrorbird pen to the west. The tortoises drop decently high priced tortoise shells but can hit pretty high and the mounted ones can hit higher but due to the swamp, you can visit there right below the pen and heal yourself with king worms and toads legs (don't forget to pull off the legs!).
The banks are very useful because they're close to yew and magic trees.
There are many ways to get to and from the Stronghold.
You're able to simply walk in. Click the front door and Femi will appear saying "Hey!" you reply "Hi!" and she asks you to help her with some boxes. Your character grabs the boxes and when you next click the front door, it opens. No quests at all it seems.
From East Ardougne, run/walk North-West until you reach the Stronghold.
If the Tree Gnome Village quest has been completed: a one-way transport (only to) exists to get to Tree Gnome Stronghold, the spirit tree in Tree Gnome Village will teleport the player to Tree Gnome Stronghold for free. If a player is not nearby a spirit tree (Northeast corner of the Grand Exchange, Battlefield of Khazard, Tree Gnome Village, Mobilising Armies) one may use a charge on a ring of duelling to teleport to Mobilising Armies, then use the spirit tree near mobilising armies to teleport to Tree Gnome Village, then use the spirit tree in Tree Gnome Village to teleport to Tree Gnome Stronghold.
Some players experienced a glitch following this graphical update in which the area would get stuck when loading.
There is a Willow tree near the Yew trees; which is odd, because this is nowhere near water, and Willow trees typically grow near water.
A gnome can be seen trapped on the cliff to the east of the stronghold, next to Baxtorian Falls.
On March 2012 a small pvp zone existed north of the grand tree. It is only 2 squares north to south but it is undetermined the length east to west The option to attack was given, the skull icon is in the corner, and it is listed as a multi combat zone. However players could not attack each other. It was fixed in an update a day later.