I remember watching this movie when I was really young so it was probably around the early 90's. It could have been a made for TV movie but I really don't know. All I remember is that a guy falls in love with a mermaid. The characters are younger and there's gold high heal shoes that he gets at the end and when he puts them on he turns into a mermaid , jumps off the dock and swims away either with her or to find her. It's not a cartoon and it's not the movie "Splash" I am fully familiar with Daryl Hannah and Tom Hanks. If anyone has any idea please let me know. Thanks!

I have been asking myself the same question for years, and some people told me I must have dreamed it... until today when I found the answer. The "movie" you are thinking of is an episode of the Jim Henson Hour entitled "Lighthouse Island". It was made in 1989. Here a description from Wikipedia

Zeb Norman comes to a strange small island town in search of the perfect gift for his fiancée, Rosalie. Zeb has never met Rosalie, but has fallen in love with her through an exchange of letters. He finds just what he's looking for in a pair of silver slippers at a local antique/curio shop owned by Clara Buford, but before he can obtain them, Clara insists that he accompany her to nearby dark, mysterious Hog Island so she can retrieve a pearl stolen from her by her rival, Fred. As it turns out, the pearl bestows upon its owner the power of transformation, and when Fred sees them coming, he takes action. As he takes on the form of a sea monster, a flying beast, and a giant tentacle, the success of Zeb and Clara's mission is suddenly very much in question.

Here is the link to the article. Lighthouse Island - Muppet Wiki - a Wikia wiki

I have been looking for this answer literally for years. I even emailed Jim Henson studios AND the TV Geek at one time (they both said they didn't know).

When I read this I actually teared it... I can't believe I can stop wondering! THANK YOU!!