I grew up playing at Pease Park, so I have a sentimental attachment to the place. That being said, you have to have a high tolerence for trash, transients, muddy trails and dogs to really enjoy this walk. Despite its weaknesses, it is a pretty impressive stretch of path in the middle of a busy cityscape. Trying to maintain a highly used park and path is nearly impossible and this place is used by lots of people.
The walk from Windsor (24th) to 29th is a no-leash zone and the dogs are plentiful. I was walking on a muddy day and acquired lots of muddy paw and nose prints on my pants, so if you aren't a dog lover, watch out for this section. The path is easy to walk and sections of it are paved. Many people use this trail for jogging, biking, walking and frisbee golf. Don't go here if you are looking for solitude. If you do want some privacy, stick to the part north of 29th, that trail is not as popular.