Have you been to this bridge? No real shops - exit Thailand - cross the bridge... Been there several times saw nothing but the Thai exit and the bridge
From Krabi Town (Muang Krabi) the Malaysian border checkpoint at Thale Ban National Park - Satun Province is about 330 kilometers - one way. We have people in the Ao Nang / Krabi Town drive there - do a border bounce in one day - about a 14-16 hour round trip. Fly to Krabi - I will rent you a car.