Crosstraining

So I was told crosstraining can help you when you are in a plateau. I am not sure what kind of crosstraining I should include.

So today I wrote a list of different activities I would like to start adding to my regimen.

Swimming- solid choice I think....costs money =/

Biking- I absolutely hate it....I am might try the new spin class and just knock it out

Classes- there are about 35 classes at the gym a week. I am thinking of doing more rotations to keep it fun and interesting

Hiking- I love to hike a bit and there is a great park down the street; however, it is already 95 and humid as all get out.

Rock climbing wall- I heard of a place down the street that does this. I was thinking of using that for a date night with my husband. I think it is my turn to pick next.

Anyone have more suggestions? I do not want to be stuck in the same rigmarole.