Dominica and St Lucia too much for two weeks?

I’ll looking at traveling to Dominica and/or St. Lucia in March. I have two weeks and would love to do both, but am worried I’ll be rushing too much. I love nature and hiking and prefer active vacations where I’m doing something most days. Not crazy about spending too much time on or around beaches (not afraid of water, I just get bored on a beach). Since I want to move around a lot, is seeing both countries in two weeks reasonable? Or will I be missing too much and rushing like an idiot?