The answers to this flat differ by the sounds of their second letters, as suggested by the keywords VAIN and VINE. Also, the word that VINE represents is capitalized.

I'm bored with the beach! I'm taking my 

   stand.

I'm tired of wading and tanning and

  sand.

I've been to the reef; I've swum with the 

   fish.

I don't want to see them except on a 

   dish.

If you want my VAIN, go on, be my

   guest.

And take, while you're at it, my fins 

   and my vest.

I'd rather stay in and spend time

   online;

I'll sit in my bed and do quizzes on 

   VINE:

"Match Actors to Roles!"

"Which cities are real?"

'How fast Can You Name All the

   Species of Eel?"

Answer:

 

VAIN = SNORKEL

VINE = SPORCLE*

 

Credit:

The Enigma 

NPL Magazine

March, 2021

LADY MONDEGREEN

 

*Sporcle is a trivia website which allows users to take quizzes on a wide range of subjects.