The only drawback is, of course, the large crowds in summer.
( ( The ( only drawback ) ) ( ( ( ( ( is , ) ( of course ) ) , ) ( ( the ( large crowds ) ) ( in summer ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ only) (NN drawback)) (VP (VBZ is) (, ,) (PP (IN of) (NP (NN course))) (, ,) (NP (NP (DT the) (JJ large) (NNS crowds)) (PP (IN in) (NP (NN summer))))) (. .)))
Summer brings with it swarms of people.
( Summer ( ( ( brings ( with it ) ) ( swarms ( of people ) ) ) . ) )
(ROOT (S (NP (NNPS Summer)) (VP (VBZ brings) (PP (IN with) (NP (PRP it))) (NP (NP (NNS swarms)) (PP (IN of) (NP (NNS people))))) (. .)))