Hey Meenakshi, I'd suggest head to Bangkok, it would be cost effective and also give you a good experience of adventure and culture. There are some interesting activities you can line up for yourself during your stay there, stuff like - River Cruise, Temple Tours, Floating Markets, Chinatown exploration, Watching the Muay Thai Fights, visiting the Weekend Markets. You can also plan a private trip to Kanchanaburi, explore sights like - Erawan Waterfall, The Death Railway, Krasae Buddha Cave Or the Pattaya Elephant Jungle Sanctuary (which is a day trip). Look for cheap and good airbnb's if you plan to travel there.