Looking for ideas

I am turning 39 this year on July 30th, which is a Wednesday this year. I have decided to do a birthday challenge over the following weekend, August 1-3.

I have been tossing around some ideas, but haven't settled on anything yet. Over the last year, I have been doing a lot of yoga. This isn't the "let's relax, meditate, and do some deep breathing and stretching" kind of yoga. I have been doing Bikram yoga, which is an hour and a half of strength building, core-stregthening, ass-kicking poses done in a room typically over 110 degrees with 100% humidity. It is one of the best workouts I have ever found. So I am thinking about doing 3 90-minute classes.

There is also the possibility of reviving my hill of life mountain bike challenge. After a break of four years (since my son was born) I have started riding again. But I don't think I could do both the yoga and the hill of life in one day, so I would need to choose.

I am looking for other ideas, so feel free to post...