How to spend S$101 (you big spender, you) in a day   by Serene Lim   Krabi should thank its lucky stars it avoided the commercialism of Phuket. And its rusticity has served it well, especially when escaping to nearby paradises of Koh Lanta and Railay with easy boat connections. The plethora of adventurous activities from caving to whitewater rafting lures hardcore junkies and eco-tourists alike. And if you can help it, don't leave Krabi without trying some of the tastiest and cheapest Thai food around. SERENE LIM   Caving tour: S$56.55   Get physical. Book the Karos Cave Day Trip organised by the Krabi Tourism (www.krabi-tourism.com/miracle-krabi/karos-cave.htm) and canoe out to see the stunning Karos caves with prehistoric cave paintings. The 1,400-baht tour also includes lunch onboard a raft, a visit to the mangrove forest and swimming in the impossibly clear waters of the lagoon.       Massage at Kantawan Spa: S$23.83   Soothe any aching muscles at Kantawan Spa (www.kantawanspa.com). The day spa is conveniently located just outside Krabi Town and a 30-minute massage starts from 590 baht.       Dinner at Bai Toey Seafood Restaurant: S$20.62   Time to treat yourself to a fabulously fresh seafood dinner. Overlooking the Krabi River, Bay Toey (on the corner of Wichit Road and Khong Kha Road) is popular with locals - always a good sign. Go all out and relish the food as the sun goes down.       Total: S$101       Prices and conversion rates accurate as of press time         This article was featured in Today August 18, 2011. http://www.todayonline.com/Travel/EDC110818-0000243/Travel-101-,,,-Krabi