summer programs for recent graduates?

Hey everyone! I have looked for summer programs / internships that graduates can do too for a long time. Most seem to be tailored for undergraduates, however I recently finished my master’s so I am not in that situation anymore. Does anyone know of these kinds of programs? Kind of a stepping stone for your career? It can be so hard to find a first job so it would be ideal for me. Thanks in advance!

It might help folks make suggestions if you note what your degree is in and what you are interested in.

Right, sorry about that! I thought I had put it in - my bad. I am a marine biologist, but basically I am also trained in environmental science and ecology. In my experience there are sometimes things advertised as “science internship programs” where there will then be different projects to choose from in different fields, so I would be happy for these to be mentioned here too. If it is more specific to my field, all the better! But please no voluntary stuff - I have done my share and done expensive degrees so I could have a proper job, I cannot volunteer my whole life.