A nice, clean, and comfy bed in a solid log cabin in the middle of 10,000 hectares of a northern forest somewhere - preferably outside of mosquito (or other biting insects) season!
The ultimate spot is in Montezuma, Costa Rica. You have to hike through the rain forest onto a clearing, there you wade through the water in the river and as you climb down the rocks toward the beach, you will see the waterfalls pouring into the ocean. It's pretty secluded and very romantic.