Thanks to a hint from Bob, I managed to complete the blinking boulders!

I should say blinking stinking boulders. Actually not too hard when you know how.
On to the trampoline/teleport bit

Stuck there for an age and a half, but eventually realised I'd been doing something wrong earlier.
I was very careful with that last section, and had no problems there.
Thanks for the ace brain strain Michelle.
