I think you can rent kayaks in Drake, and there's also a zipline company that picks up at the bottom of the hill. Time specifics will matter here as most tours are not in Drake proper, but can involve up to an hour boat ride each way (i.e. Corcovado), and also leave VERY early (5:30/6am) for best wildlife viewing. I have no idea what kind of timeframes the cruises are on, but I think in all likelihood, it will be impossible to difficult for you to do Corcovado or Cano.
If you are able, you must visit Curt at Gringo Curt's - he's up the hill just past the 2 markets. His fish tacos are the best thing in town, and he's extremely knowledgeable about the area, and many of the old-timer local guides hang out there as well, so there's plenty of character and talking story. If you hit him up for coffee first thing you disembark, he will for sure have other ideas of activities.