Yeah, the OP seems to have ruled out Bonaire due to lack of activities on shore that aren't too "touristy," but you're right that Curacao might be more to his liking.
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Being from Switzerland, have you considered going to Dahab on the Red Sea. Probably the best shore diving in the world. MUCH better than Belize, and much closer for you. No forests, but great Wadis, St Catherines Monastery and a nice place to chill and hang out. I used to work there way back and loved it. Went for a month and stayed nearly 3 years.