A Walk in the Park is mostly a filler module for the trilogy, The Jungle has Fangs, it's plagued by little issues that amount to a generally forgettable experience, but can be saved through a bit of preparation by the DM.
My first issue with this mod as it introduces the emerald enclave to the party rather than continuing with Soggy Wren and the Harpers as A Day at the Races leaves you. It is unclear why Screaming Wind shows up out of no where. As a DM, you may want to stitch this connection by bringing in the co-operation between the factions in 07-01, A City on the Edge and say she was sent by Wren. In addition, you may also want to add hooks for Lords Alliance and Zhentarim while the characters are in the city too, that way they aren't blindsided by their involvement in Whispers in the Dark.
The fishing kids adds a fun mechanic, although losing 1-10g may not be enough to motivate the players to chase orphans through the street. If you're DMing and aren't constrained for time, have them actually steal more money or a critical item to inspire the players to chase (which leads them to the encounter with the thugs)
I found that the Satchel Shop will almost always devolve into a violent interogation as it's hard to believe that the shop's owner isn't involved in the illicit trade. Seperating the shop owner from the production of the goods and/or bringing Wadumu in sooner can help difuse any confrontations for you.
During the next part of the adventure I would add two additional dialogues with Wadumu. Maybe split up his story over the course of three nights, add to the build up/investment of the characters to help free this guy's village. Maybe even some grewsome details about how the Wanderlust is made could add some much needed hooks for the player. Wadumu will most likely be beloved and trusted implicitly because his cute frogginess and the gift of a magic item in the first 30 seconds of meeting him. However, the PCs will want to know more about him and it will help to add some more heart to the mostly mundane adventure.
Also, the mudslide encounter could use some time to prep and envision. The event lacks the kind of description of the scene and encounter mechanics that can leave the players confused.
The biggest missed opportunity is the lack of an antagonist. The blame rests solely on the faceless Yuan-ti threat. Having a named villian with some kind of personality and hooks to the direction of the Queen in Whispers in the Dark would help to tie the adventures together.
Over all, the adventure suffers from a few issues, but nothing damning. Mostly they are muddled plot points and missed opportunities that can be easily changed/enhanced by a DM that has more than 2 hours to run this mod. Wamumu really makes this adventure fun, try to capitolize on his energy and your players will walk away happy.