It's skateboard parks.
However, that doesn't mean that you should stop practicing and dreaming up your killer combos. Fingerboards are a great and cheap way to experiment with painlessly learn the physics behind the moves.
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Tech Deck has some amazing ramps, rails and staplers, binders and books. Here are some tricks to get you started:
Shove It: Start in the standard position, place your index finger on the middle of the board and your spin the board and apply pressure with the index for control.
Ollie: From the standard position, move backwards suddenly and push down with the middle finger to index to the nose of the board to balance out and land flat.
Slides and Grinds: Use an Ollie and land the board on a rail or edge to slide and grind. If you turn the board 90 degrees and land with the board itself, that's a slide. If you land on the grind.
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two hands to operate the board.
There are also fingersnowboards if you want to try out some of the 2010 Winter Olympics. Gravity Fingerboards make some real nice fingersnowboards and you can use you almost anywhere you use regular fingerboards.