Thanks for responses.

It was a very clear day. I just had trouble judging the distance and
speed over the ocean as a non-pilot/aviation-layman. I'm sure we were
at a safe height and I've learned not to trust those perceptions and
didn't worry.

It surprised me how slow planes appear to land and takeoff from a
distance. It looks like about 15-30mph, just barely moving along, but
I know it's much faster.