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))))) (. .)))
Although it gets crowded in summer, it is still the best time to visit.
( ( Although ( it ( gets ( crowded ( in summer ) ) ) ) ) ( , ( it ( ( ( is still ) ( ( the ( best time ) ) ( to visit ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Although) (S (NP (PRP it)) (VP (VBZ gets) (ADJP (VBN crowded) (PP (IN in) (NP (NN summer))))))) (, ,) (NP (PRP it)) (VP (VBZ is) (ADVP (RB still)) (NP (NP (DT the) (JJS best) (NN time)) (PP (TO to) (NP (NN visit))))) (. .)))