Look out at your lawns and gardens...do they need work?  Get out there and clean them up.  Just be careful to bend at your knees not your back.

Here's a list of how many calories your burn doing various fall activities. (Wait til you see what shoveling snow is next month - hope we don't have to do it though)

Weight = Calories burned per hour
Divide this number by 1/2 if you can only work for 30 minutes. It still counts!

Raking your lawn (Moderate Effort)
125 lbs = 227 calories per hour 
150 lbs = 273 cals per hour
175 lbs = 318 cals per hour
200 lbs = 364 cals per hour
225 lbs = 409 cals per hour
250 lbs = 455 cals per hour
275 lbs = 500 cals per hour
300 lbs = 545 cals per hour

Gardening - Turning over beds, planting or transplanting bulbs
125 lbs = 284 cals per hour
150 lbs = 341 cals per hour
175 lbs = 398 cals per hour
200 lbs = 455 cals per hour
225 lbs = 511 cals per hour
250 lbs = 568 cals per hour
275 lbs = 625 cals per hour
300 lbs = 682 cals per hour

Congratulations, you burned some calories and spruced up your yard at the same time.  Now don't forget to stretch AFTERWARDS and drink a ton of water.