When you say "quite tall", how tall/large are we talking? If you are referring to a large tree, you aren't going to be able to straighten that by tying it to a gazebo. If you are talking about a young flexible tree, post pictures and we can go from there.

As mentioned need more info...I can tell you one thing, DO NOT use rope! You'll need something that is more "strap" like.

If it looks like a hazard call a certified arborist out to take a look at it. Trees are much heavier and deadly than they look from the ground.

sorry for the delay, boy it's strange how in your mind you think of stuff in your yard a certain way (ie: this tree never really seemed tall to me, I guess cuz I remember it being so much smaller when we moved in). but it's very very tall now and leaning..so I dont know what if anything can be done.

I also do not remember it leaning until this year, maybe last? We moved into this house in 04 and it was probably even with the gazebo/swing.

{{gwi:434560}}

Well, the gazebo is out. Tying that large tree to the gazebo would only possibly result in the destruction of the gazebo and do nothing for the tree.

Help us interpret your picture. To me, it looks like the trunk starts out, at the base, pretty straight, then leans, and finally grows pretty straight for the top half of the tree. Am I seeing it correctly? If so, there's really no reason that I can see that you'd need to worry about it. If however, the tree is leaning at the base and you can tell that there has been a change, that could be an indication of serious problems.