I have a tough time telling if my cantaloupe is ripe (without opening it and trying it. Any suggestions?
Cantaloupe should feel heavier than it looks and smell musky and sweet. Also you should be able to press your thumb in slightly on the bottom and there shouldn't be a lip around the stem.
If it smells over-sweet it's most likely over ripe. You can let a cantaloupe ripen on your counter top if you get one under-ripe
the smell of the melon, peaches, etc. will tell you if they are ripe. the firmness of fruit will tell if overripe, however that won't work with melons. An overly sweet melon usually mean its too ripe.