Yes, it is 100% safe to be around whales in a kayak. Whales don’t pose any danger to you unless they are provoked.
Whales never bump into kayaks or act aggressively in away way unless they are provoked, and even then, they prefer to walk away.
Despite their huge size, they prefer to mind their business. This means that you don’t have to worry that whale bump into your kayak and injure you on the process.
However, while kayaking around whales, be silent and don’t go too close to them.
Also, ensure that you have the right protective gear and company to save you just in case of anything.