DAY 1: Take direct flight from Mumbai to Bangkok. To reach Pattaya (125 km), you can prefer to take a taxi. Reach Pattaya in 2 hrs time. The Bay View Hotel is nice and pocket friendly option for stay. Take rest and be ready for day 2.
DAY 2: Left from hotel after breakfast to Koh Larn Beach and enjoy some water sports. You can find many Indian restaurants while returning to Hotel.
You have enough time to spent in evening. "Art in Paradise" is must visit place. You can't stop yourself from taking 3D pictures there.
DAY4: Leave for Phuket by taking flight. Its 1 hr journey. In evening, you can enjoy Cabaret show and night market.
DAY 5: A tour to James Bond Island through Big Boat. You can enjoy the sight scenes a lot.
Take evening flight for Bangkok. The Baiyoke Hotel offer you a sky high rooms and a very amazing view of the city from its 83rd Floor.