there called dryad's. first you just let only a little bit of dryad's get on you which will lift you on the platform when you get on the platform shake the mouse so the dryad's don't lift you too high keep repeating this until your done.
All I did was go to home, and clicked on the "Play Now" button next to the picture of the noggan on the Twisted Thicket ad. It should bring you back to the start of the course. I suppose this only works temporarily, because Poptropica tends to change the ads every then and now.
Once you have moved through the 5 areas, you reach the forest center and the Elf Queen. To access the center, place the 5 runes on the correct spots on the tree, in the correct order : acorn, plant, tree, fruited tree, stump. The brambles will disappear and you can enter.
There are no goblins in Twisted Thicket. They are the Gremlins. Although they are fast runners, you can stay ahead of them by jumping the obstacles or ducking under the hanging baskets. (see related question) -- *To beat the goblins on Twisted Wizard (Wimpy Wonderland) see the related question.
The island that has been advertised after Vampire's Curse Island is Poptropolis Games Island. It should be released within the next month or two and you are available to watch the trailer for a Sneak Peak of the Island.