How strong do lasik flaps heal? should i be worried about water slides and tubing on a boat? could they get dislodged from things like that?

Unlikely: I have performed thousands of lasik surgeries and have only seen one flap dislodge once a few months pass. It was due to a severe tree branch injury hitting the cornea and was repaired successfully. The corneal healing is likely fully healed in a few months not to limit your enjoyment of life. I'd avoid it in the first month, but after that, tubing and water slides should be fine to do.

Maybe: Time since your surgery is vitally important here.If it has been many months or years, dislodging is unlikely.If you are concerned, however, avoidance or wear goggles!

Not as strong as: normal corneas. I have seen flaps dislodge a decade later but this is very rare. Generally its caused by something directly poking the eye like a finger and impacting the flap. Water is not a culprit in these cases. Stay safe.