first you start of getting lots of nice entrys while adding in some flips and twists (try to keep a combo going by quickly entering the water then leaving)
after getting about 15-20 nice entrys do a tailslide trying to keep yourself completely horizontal
this will send the dolphin at a 45* angle significantly increasing its speed
when you come back down go in and then go back out completely vertical
at this point you want to get in alot of starslides by holding the down arrow
you should reach mars or jupiter
on the next entry go horisontal again and do another tailslide this should rocket you back up into space
get in alot of tailslides and severely increase your speed
at about 00:15 make sure ur back ona downward track
get one last nice entry and do another tailslide
the faster you do tailslides that faster you will go
on this last acent hit as many starlides as you can (hold down the whole time and right when you hit a slide immediatly hit up)
do this all the way up to pluto
this if this is all done correctly you will pass the End Of The Universe - It looks like a restaraunt
Good luck and it will take more than one try