On that day we rejoice with outside games, music and picnics, sort of a Jewish May Day. Lag B Omer seems to herald the season of barbecues and lazy outside meals with lots of fun and games. Use a long branch if available or an old broomstick. Sing some fun songs and weave in and out in a traditional May Pole dance. Any Judaic shop can direct you to the newest and best Israeli music from folk to hard rock.
People often mistake thirst for hunger.
To avoid either excess calories or artificial sweeteners, bring lost of chilled spring water. For a special treat. make your own lemonade. Bring some treats like oatmeal cookies or low-fat granola for snacks. Avoid high fat, super salty or super sweet snacks like chips and high fat cookies. Even a cool May day can produce enough sun for a burn.