From myths of the white lands: 1 quest point 5k (if you wait for a little bit) gold acess to the cave Lumbridge acheivments: Begginer: run energy (1) ring easy: run energy (2) with alchemy ring medium: [edit this for medium im too lazy]
Explorer Jack can be found next to Lumbridge General Store.
Explorer Jack is found a few squares south-west of the training area in Lumbridge.
I only know 1 and it is land
There are different ones for each diary for example explorer jack and captain ned are the taskmasters for lumbridge and there are others in varrock, falador, seers village, karamja etc. Each one gives the rewards for each diary.
Under the axle tube directly below the leaf springs ( factory jack used with Explorer )
There are several NPCs called "Jack". One of them is "Explorer Jack", which you can find north of Lumbridge Castle.
under the car
On a 1996 Ford Explorer : The vehicle jack is supposed to be behind the removable plastic panel , on the drivers side of the cargo area , near the liftgate
On a 2000 Ford Explorer : The jack is stored in the cargo area , behind the removable plastic panel on the drivers side , near the liftgate Lower the jack down and then raise the jack by hand so the top of the jack is held securely by the vehicle bracket
In Lumbridge, in the building near the shop.
beneath the vehicle
You can get a free silver membership for free first you go on smartycard.com then you get an account or log in if you already have an account then you play games and get over 4500 points then go to rewards then one of the rewards say: free dizzywood silver explorer then it will tell you what to do! hope I helped! :D