Some of the logistics of becoming a spacefaring pooltoy:
Your buoyancy no longer comes down to the atmosphere you're in—it also depends on where you last filled up
If you can find or store something more buoyant than your current atmosphere, you don't need any special equipment to escape the planet's gravity (let's say you don't pop from the pressure differentials, pooltoy magic)
While you don't have to worry about anything being toxic to take in, since you've become abiotic and all, you'll still want to keep track of what gas you're filled with in case any leaks would affect the local creatures
You can deflate and reinflate yourself during re-entry to finetune your landing