This is about the minimum time we'd suggest if to see both islands. Be aware that in four weeks, a lot of driving is involved though! But you'll still get to experience the highlights of both islands.
14.3 km (8.9 mi)
33 min
545 m (0.3 mi)
2 min
668 m (0.4 mi)
2 min
425 m (0.3 mi)
2 min
1.1 km (0.7 mi)
4 min
1.3 km (0.8 mi)
4 min
10.3 km (6.4 mi)
17 min