I believe this is just a the theoretical question since the op has said in another thread "I am just a kid". I think he needs to wait another 50 years before making up his mind. At his age, nothing decided now will produce much fruit for the effort.
Now I know I am still young, but when that time comes I would want the collection to be passed on to my family, as a way of remembrance of me and a hobby I passionately pursued.
Watermelons? I would prefer a nice black raspberry patch. Fruit looks tempting, but you get cut up with thorns if you try to pick them.
Actually, I think the OP should be stuffed and mounted, while holding the coins, in the event of his demise. Get a good taxidermist.
It is actually a berry subdivision of fruit, and they do love to grow in manure But I thought they had small gravesites in NYC. Watermelon takes a lot of space. Jim
I have to say this, years back when my great grandfather whom I've never met died, left a map to my grandparents. There was an "x" on map for each place he buried his coins. When my grandparents recovered all the silver coins they went and sold them for the price of silver, which at the time was 3 or 4 dollars. But these coins were in good condition. Darn.