There's not much to do landside at the airport that would make the hassle of inbound/outbound immigration worth it for that length of time, nor $22. A bunch of average restaurants and a food court. 3 hours is a bit too short to go far outside the airport, and there's not much nearby anyway. The small Paseo outdoor shopping mall is 10-15 minutes away by cab if you just have to get out of the airport. Or you can buy access to a Miracle lounge airside if you don't have other lounge access.