Thunderbird Park offers a few different hikes ranging from about 30 minutes to a couple hours depending on your speed. The trails are all fairly easy to manage. Some are easier than others, in that they are essentially just gravel, while others have a few rocks that require traversing.
The views from each of the trails are beautiful so you won't be disappointed in any path you choose.
I've never had a problem with parking, though I've seen the lot get pretty full.
Take advantage of these fun hikes while the weather permits and remember to bring water, especially if choosing a longer hike and as the weather starts to get hot again!