I have never been to Disneyland, but apparently there are mermaids to be seen there! This is a video of a pair of mermaids hanging out in the pool at the Disneyland hotel.
Not only are there mermaids there now, but there have been mermaids there for some time! Here is some family’s home video of their 1964 trip to Disneyland. The mermaids are at 1:34 if you don’t feel like watching the whole thing.