Sites on the way to the airport

Hi. We'll have about a 1/2 day to stop off and see some sites on the way from Reykjavik to the airport. We'll be driving and will not be going to the Blue Lagoon (going to other lagoons/springs during our trip). I was thinking of going to Kleifarvatn Lake, then Seltun (sorry, my keyboard doesn't have all the proper keys), then the Reykjanes LIghthouse/area on the way to the airport. Is this too much for about a 1/2 day (our flight is at 5:00)? If so, what would you recommend seeing/skipping? Thanks!

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