My Non-Moving Trip...or Two!

So... I want to do a three day weekend thing in Vegas with friends and the hubby and go to Mexico or something for maybe a four day weekend with JUST him... I told him on our honeymoon that he needed to take me somewhere warm and tropical... We honeymooned in Moscow in the winter and then on our first anniversary was up in Wisconsin... also in the winter. I want warm!! I also figure this would be a good way to divert my attention and focus off of the house thing and onto something else fun. But, where in Mexico should we go? We want to lay on the beach (like whales...lol big white whales) and go looking at and hiking through ruins and stuff. And we don't want to spend a whole lot... Whee!