Too many tourists from the future

If you're not averse to mods, you can block tourists with NRaas Register.

Ah I have that thank you. I thought I had checked all the NRaas mods I have but somehow missed it.
Can't wait to go back in and stifle those beggars.

Register is probably what is producing the large number of future world tourists. Our developer seemed very proud of an enhancement he made to the mod that allowed for more of these visitors a while back and then seemed a bit surprised when many of us reported rushing over to switch that feature off -- Tourism can be stifled by deselecting source worlds and Oasis Landing will be on the list once it is visited along with any others. Yes, they will get a bit carried away with the visiting thing otherwise.

Thank you @igazor Yes they did get carried away to put it mildly.
I think I have it fixed now hopefully. Will know next time I "visit" the future.