This Seeking Tech guide will explain how you can jump on the giant trees in the Az-Tech Trail of Astro Bot.
Use the following video as a reference:
You first need to head to the section where you need to destroy the giant crates.
Instead of destroying these crates, you need to jump across the large gap. You will need to use your regular punch and the power-up punch to jump the extra distance. It may take you several tries to pull it off.
Once you get to the other platform, climb the hill to the left.
You should now be able to access the treetops of this section.